diff --git a/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/libraries/quarkus/pom.mustache b/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/libraries/quarkus/pom.mustache
index 96bf9f82cbe9..5250e3a7d302 100644
--- a/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/libraries/quarkus/pom.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/libraries/quarkus/pom.mustache
@@ -50,6 +50,9 @@
 {{#useMutiny}}
     <smallrye.rest.client.version>1.2.1</smallrye.rest.client.version>
 {{/useMutiny}}
+{{#openApiNullable}}
+    <jackson-databind-nullable-version>0.2.8</jackson-databind-nullable-version>
+{{/openApiNullable}}
   </properties>
   <dependencyManagement>
     <dependencies>
@@ -137,6 +140,13 @@
       <scope>test</scope>
     </dependency>
 {{/useMutiny}}
+{{#openApiNullable}}
+    <dependency>
+      <groupId>org.openapitools</groupId>
+      <artifactId>jackson-databind-nullable</artifactId>
+      <version>${jackson-databind-nullable-version}</version>
+    </dependency>
+{{/openApiNullable}}
   </dependencies>
   <build>
     <plugins>
diff --git a/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/pojo.mustache b/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/pojo.mustache
index 419f8b37ba03..8d1c6732a1f6 100644
--- a/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/pojo.mustache
+++ b/modules/openapi-generator/src/main/resources/JavaJaxRS/spec/pojo.mustache
@@ -11,6 +11,9 @@ import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
 {{/jackson}}
+{{#openApiNullable}}
+import org.openapitools.jackson.nullable.JsonNullable;
+{{/openApiNullable}}
 {{#withXml}}
 import {{javaxPackage}}.xml.bind.annotation.XmlElement;
 import {{javaxPackage}}.xml.bind.annotation.XmlRootElement;
@@ -47,7 +50,17 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#vendorExtens
   {{#vendorExtensions.x-field-extra-annotation}}
   {{{.}}}
   {{/vendorExtensions.x-field-extra-annotation}}
+  {{#vendorExtensions.x-is-jackson-optional-nullable}}
+  {{#isContainer}}
+  private JsonNullable<{{{datatypeWithEnum}}}> {{name}} = JsonNullable.<{{{datatypeWithEnum}}}>undefined();
+  {{/isContainer}}
+  {{^isContainer}}
+  private JsonNullable<{{{datatypeWithEnum}}}> {{name}} = JsonNullable.<{{{datatypeWithEnum}}}>{{#defaultValue}}of({{{.}}}){{/defaultValue}}{{^defaultValue}}undefined(){{/defaultValue}};
+  {{/isContainer}}
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
+  {{^vendorExtensions.x-is-jackson-optional-nullable}}
   private {{#isContainer}}{{#useBeanValidation}}@Valid {{/useBeanValidation}}{{/isContainer}}{{{datatypeWithEnum}}} {{name}}{{#defaultValue}} = {{{.}}}{{/defaultValue}};
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
   {{/vars}}
 
   {{#generateBuilders}}
@@ -105,7 +118,12 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#vendorExtens
    {{/maximum}}
    **/
   public {{classname}} {{name}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-is-jackson-optional-nullable}}
+    this.{{name}} = JsonNullable.<{{{datatypeWithEnum}}}>of({{name}});
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
+  {{^vendorExtensions.x-is-jackson-optional-nullable}}
     this.{{name}} = {{name}};
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
     return this;
   }
 
@@ -117,16 +135,28 @@ public class {{classname}} {{#parent}}extends {{{.}}}{{/parent}} {{#vendorExtens
   @Schema({{#example}}example = "{{{.}}}", {{/example}}{{#required}}required = {{required}}, {{/required}}description = "{{{description}}}"){{/useSwaggerV3Annotations}}{{#useMicroProfileOpenAPIAnnotations}}
   @org.eclipse.microprofile.openapi.annotations.media.Schema({{#example}}example = "{{{.}}}", {{/example}}{{#required}}required = {{required}}, {{/required}}description = "{{{description}}}"){{/useMicroProfileOpenAPIAnnotations}}
   {{#jackson}}@JsonProperty({{#required}}required = {{required}}, value = {{/required}}"{{baseName}}"){{/jackson}}
+  {{#vendorExtensions.x-is-jackson-optional-nullable}}
+  public JsonNullable<{{{datatypeWithEnum}}}> {{getter}}() {
+    return {{name}};
+  }
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
+  {{^vendorExtensions.x-is-jackson-optional-nullable}}
   {{#useBeanValidation}}{{>beanValidation}}{{/useBeanValidation}}public {{>beanValidatedType}} {{getter}}() {
     return {{name}};
   }
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
 
   {{#jackson}}
   @JsonProperty({{#required}}required = {{required}}, value = {{/required}}"{{baseName}}")
   {{/jackson}}
   {{#vendorExtensions.x-setter-extra-annotation}}{{{vendorExtensions.x-setter-extra-annotation}}}
   {{/vendorExtensions.x-setter-extra-annotation}}public void {{setter}}({{{datatypeWithEnum}}} {{name}}) {
+  {{#vendorExtensions.x-is-jackson-optional-nullable}}
+      this.{{name}} = JsonNullable.<{{{datatypeWithEnum}}}>of({{name}});
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
+  {{^vendorExtensions.x-is-jackson-optional-nullable}}
     this.{{name}} = {{name}};
+  {{/vendorExtensions.x-is-jackson-optional-nullable}}
   }
 
   {{#isArray}}
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
index 3eb76e4356c3..5bf47de260b9 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
index 56d56340b0d1..09af9311bff1 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
index 4b927a10aede..e902f8d6ad55 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 1f462e7f235f..7b384f45ec2d 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
index 58722c73f257..723b8ad4150b 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
index 47c277018f81..7fecf38237d2 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
index 994eb67f139a..4d87b92c8c1c 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
index ef49aa7ef3b1..b0fe11d7fc21 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Animal.java
index 5c452458acc4..bcfa945e087b 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Animal.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index de0a90c29fac..21adeecbebc9 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 2f5b4779a17e..8380c2f456e1 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayTest.java
index e067c0ce4c13..bf6c4ea3b9dc 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/BigCat.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/BigCat.java
index e0a16e0c4063..05d666cae6b0 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/BigCat.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/BigCat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Capitalization.java
index 0c737406f182..6c11b54f5d68 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Capitalization.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Cat.java
index 86d81bbf398d..c024257b10ea 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Cat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Category.java
index ffb6c4d785e6..e28ac9466e90 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Category.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ClassModel.java
index 355c219c8d9f..58f12cba6500 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ClassModel.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Client.java
index 4a68cb40cdf3..d14d9b92a98d 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Client.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Dog.java
index b028c9024f47..ca932213e6db 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Dog.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumArrays.java
index 16ca3a6f3077..901ba5547d4f 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumTest.java
index e8b6668837de..222794eb2fbf 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/EnumTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index c687b154b551..931af90b5dca 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FormatTest.java
index d1c2a58f3a95..a705e6bf5a6e 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/FormatTest.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 94eb5f93dbec..7df4d05f8d7f 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MapTest.java
index 056801a15789..df49e023daa5 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MapTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 9b6ae21e0713..3d162d2dd241 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Model200Response.java
index fbab52aea568..60110ceecdf6 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Model200Response.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 0c80a0765b22..5b299967df03 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelFile.java
index 4b7edb83eb6d..e60d714a3356 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelFile.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelList.java
index a3bb884ffeb6..4a5a995660a4 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelList.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelReturn.java
index 6f92ce8de613..b259b0be0c18 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Name.java
index 846e54f5428e..33e572d6fcf5 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Name.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/NumberOnly.java
index ea432a49ec70..865d03627c14 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Order.java
index 81efbd82c824..a20239e303fd 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Order.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/OuterComposite.java
index 058582493723..1397d2752011 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Pet.java
index d94dae394920..3b40d982b14e 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Pet.java
@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 963eb4d06988..47e25b2a24d7 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/SpecialModelName.java
index fda106223965..8533a8317422 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Tag.java
index 8297fc6ff7e0..c11e1ae8dd78 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/Tag.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderDefault.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderDefault.java
index 7cbbd98479f1..fdf015b60b6f 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderDefault.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderDefault.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderExample.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderExample.java
index d7d148b667f6..b4e43cb36b71 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderExample.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/TypeHolderExample.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/User.java
index 2e374c78c6aa..a79e4d675b2c 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/User.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/XmlItem.java b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/XmlItem.java
index f1f9b9102579..26c4e3e1e6c5 100644
--- a/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/XmlItem.java
+++ b/samples/server/petstore/jaxrs-spec-interface-response/src/gen/java/org/openapitools/model/XmlItem.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
index 3eb76e4356c3..5bf47de260b9 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
index 56d56340b0d1..09af9311bff1 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
index 4b927a10aede..e902f8d6ad55 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 1f462e7f235f..7b384f45ec2d 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
index 58722c73f257..723b8ad4150b 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
index 47c277018f81..7fecf38237d2 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
index 994eb67f139a..4d87b92c8c1c 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
index ef49aa7ef3b1..b0fe11d7fc21 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Animal.java
index 5c452458acc4..bcfa945e087b 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Animal.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index de0a90c29fac..21adeecbebc9 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 2f5b4779a17e..8380c2f456e1 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayTest.java
index e067c0ce4c13..bf6c4ea3b9dc 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/BigCat.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/BigCat.java
index e0a16e0c4063..05d666cae6b0 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/BigCat.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/BigCat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Capitalization.java
index 0c737406f182..6c11b54f5d68 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Capitalization.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Cat.java
index 86d81bbf398d..c024257b10ea 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Cat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Category.java
index ffb6c4d785e6..e28ac9466e90 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Category.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ClassModel.java
index 355c219c8d9f..58f12cba6500 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ClassModel.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Client.java
index 4a68cb40cdf3..d14d9b92a98d 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Client.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Dog.java
index b028c9024f47..ca932213e6db 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Dog.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumArrays.java
index 16ca3a6f3077..901ba5547d4f 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumTest.java
index e8b6668837de..222794eb2fbf 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/EnumTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index c687b154b551..931af90b5dca 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FormatTest.java
index d1c2a58f3a95..a705e6bf5a6e 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/FormatTest.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 94eb5f93dbec..7df4d05f8d7f 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MapTest.java
index 056801a15789..df49e023daa5 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MapTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 9b6ae21e0713..3d162d2dd241 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Model200Response.java
index fbab52aea568..60110ceecdf6 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Model200Response.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 0c80a0765b22..5b299967df03 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelFile.java
index 4b7edb83eb6d..e60d714a3356 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelFile.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelList.java
index a3bb884ffeb6..4a5a995660a4 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelList.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelReturn.java
index 6f92ce8de613..b259b0be0c18 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Name.java
index 846e54f5428e..33e572d6fcf5 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Name.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/NumberOnly.java
index ea432a49ec70..865d03627c14 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Order.java
index 81efbd82c824..a20239e303fd 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Order.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/OuterComposite.java
index 058582493723..1397d2752011 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Pet.java
index d94dae394920..3b40d982b14e 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Pet.java
@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 963eb4d06988..47e25b2a24d7 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/SpecialModelName.java
index fda106223965..8533a8317422 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Tag.java
index 8297fc6ff7e0..c11e1ae8dd78 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/Tag.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderDefault.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderDefault.java
index 7cbbd98479f1..fdf015b60b6f 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderDefault.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderDefault.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderExample.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderExample.java
index d7d148b667f6..b4e43cb36b71 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderExample.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/TypeHolderExample.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/User.java
index 2e374c78c6aa..a79e4d675b2c 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/User.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/XmlItem.java b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/XmlItem.java
index f1f9b9102579..26c4e3e1e6c5 100644
--- a/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/XmlItem.java
+++ b/samples/server/petstore/jaxrs-spec-interface/src/gen/java/org/openapitools/model/XmlItem.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
index 9281edbd3b52..0ef9281744b4 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
index 9f8a96bef636..fe7ac0df377f 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
index 180b76e16456..78ba61b05466 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index ff345041662e..fd7e757bff08 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
index 770db3dde9c7..24029d8f6192 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
index 6aec02879f45..9b25d55e65c2 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
index b17c38f2e9b8..0de2d6b27d89 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
index 9dbff6d5c7a1..48a7acf8d1dd 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Animal.java
index db4cf6504745..2013c918ae2e 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Animal.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index 5b8c60c620b3..c6fee73d23ac 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 91f772da7ea8..418c73883458 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java
index 472ffee52d17..2f0db13d8ed7 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/BigCat.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/BigCat.java
index d1b446146f4d..e8bc2e914cdf 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/BigCat.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/BigCat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Capitalization.java
index 8874d2d0536b..c12fffa64c4d 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Capitalization.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Cat.java
index 90c0475eae12..35445761c997 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Cat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Category.java
index 9d24108ea2be..a7756375f685 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Category.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ClassModel.java
index c8b92e2c32e4..73df9bf61819 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ClassModel.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Client.java
index a34822a5150f..e51c959fe243 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Client.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Dog.java
index 3482b3184ff3..0036b8a29ea2 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Dog.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java
index a67ffb962b38..a344a8793b7f 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumTest.java
index bc7702f73e90..d1192ab5fc44 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/EnumTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index f1a55cd98cf6..90a300c1ceaa 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FormatTest.java
index 2b8356294490..a58bd7720059 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/FormatTest.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 587df7a8865f..c2c06a592ad7 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MapTest.java
index dcc371175494..0709fbed667e 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MapTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 3dc4ed0d73a5..20e797ba3629 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Model200Response.java
index 95c609ae6932..fde91fcc415a 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Model200Response.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 09f937b95bec..ec2c35677e3e 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelFile.java
index ce0552dc12d5..eb953a3a4c9b 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelFile.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelList.java
index e2833e0006aa..ba40bf272d93 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelList.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java
index b78232b09734..0f57797675f8 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Name.java
index d9d37b9e8b58..686bd5358030 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Name.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java
index aacd60b9b1cc..e7a878d876e3 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Order.java
index adec533a0ff4..e4d0e925674c 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Order.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java
index f1a792b6f47a..1c4fa5dc59f4 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Pet.java
index 66c0363d776a..0cb3df4daa8b 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Pet.java
@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 98b6adfe515a..f5be78571a32 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java
index 4ff8c0f9dbce..4df8721faaab 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Tag.java
index 96ed87d4c328..962abe0af4c7 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/Tag.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderDefault.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderDefault.java
index 29273246dad2..eea091075a26 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderDefault.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderDefault.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderExample.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderExample.java
index 3cc98fb706a4..874ac579a19e 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderExample.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/TypeHolderExample.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/User.java
index 5ff83d462af5..ed877c642341 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/User.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/XmlItem.java b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/XmlItem.java
index f6bef40d0930..7d07e55590ab 100644
--- a/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/XmlItem.java
+++ b/samples/server/petstore/jaxrs-spec-jakarta/src/gen/java/org/openapitools/model/XmlItem.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/pom.xml b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/pom.xml
index 90276528726a..04055c96d210 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/pom.xml
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/pom.xml
@@ -22,6 +22,7 @@
     <surefire-plugin.version>2.22.1</surefire-plugin.version>
     <javax.ws.rs-version>2.1.1</javax.ws.rs-version>
     <javax.annotation-api-version>1.3.2</javax.annotation-api-version>
+    <jackson-databind-nullable-version>0.2.8</jackson-databind-nullable-version>
   </properties>
   <dependencyManagement>
     <dependencies>
@@ -64,6 +65,11 @@
        <artifactId>javax.annotation-api</artifactId>
        <version>${javax.annotation-api-version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.openapitools</groupId>
+      <artifactId>jackson-databind-nullable</artifactId>
+      <version>${jackson-databind-nullable-version}</version>
+    </dependency>
   </dependencies>
   <build>
     <plugins>
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
index 2144a3554147..0bf5d5b4399c 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesAnyType.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
index c50634f9b0a3..0607b2aab4db 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesArray.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
index 03a21e9a3147..33bff45f4f53 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesBoolean.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 57c863f3ec86..a347e46d1abc 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
index c17e54283b84..248b7091171f 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesInteger.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
index 728a9f19768b..76023754035c 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesNumber.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
index 9cfd41f4c5e5..04f787eb5ea5 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesObject.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
index 0cfcca8cd4ed..ff7931ff7d8b 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesString.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Animal.java
index 0e7abe2369c1..bc1b6cf42aaa 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Animal.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index dbdaa9339c72..244c0fd54e48 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 832a8b877823..36396042fe00 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
index cbda27410830..c52984da2d6b 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/BigCat.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/BigCat.java
index 574d254c4036..3df2e2b0f7a1 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/BigCat.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/BigCat.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Capitalization.java
index 5b6e54a2e7a8..63653286cba4 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Capitalization.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Cat.java
index d5e980050219..142e6d6af057 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Cat.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Category.java
index 741e0f5cd1cb..fc1ce5cba10f 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Category.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ClassModel.java
index 9e6f3976d79d..2bf9a8d2660d 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ClassModel.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Client.java
index 3c1d6d2743c5..58d508188fa0 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Client.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Dog.java
index 62874a34729c..94158246c48c 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Dog.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
index f27e8be8420d..53f77982f2d0 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumTest.java
index bcafd0339c59..42298c9581af 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/EnumTest.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index 96f39136a8ae..78a4d340bd2e 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FormatTest.java
index 4e1c7e659e7b..f5b6847fda1a 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/FormatTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 75f4273f1e18..dd57b55f350b 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MapTest.java
index 71e35dfa494a..153bec278423 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MapTest.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 149d149f67cd..9bb20135d8fa 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Model200Response.java
index 731b4c8871ae..a05978cf6c17 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Model200Response.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 6df118716138..18bcfd02d0e5 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelFile.java
index 98e6c52dee7a..330cd92b1f06 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelFile.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelList.java
index 19a4cbf3a0ea..888ef323648c 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelList.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
index a78fa512ad2f..fcbe4cb9821a 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Name.java
index 4599a5475318..f2d4694cd081 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Name.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
index 71908917ea08..687cdb21e91d 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Order.java
index 95a90b6fabcc..887250adb7d7 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Order.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
index d34ba74d1eff..33a1518e8186 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Pet.java
index 53c740a1b6c2..2945f38d8958 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Pet.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 01a771d67b4f..8642f629d6ba 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
index 68bdc481b2e3..be6ea73f6060 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Tag.java
index 5d37e523dc2a..83a4c5b6ee36 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/Tag.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderDefault.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderDefault.java
index b3bd710bf47a..c838bcf2dfa6 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderDefault.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderDefault.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderExample.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderExample.java
index 648d0797d612..9a88056d2f08 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderExample.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/TypeHolderExample.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/User.java
index 460f6864d40b..6ca3f7e7d45c 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/User.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/XmlItem.java b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/XmlItem.java
index 0582f8b99b38..65092da8a57f 100644
--- a/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/XmlItem.java
+++ b/samples/server/petstore/jaxrs-spec-microprofile-openapi-annotations/src/gen/java/org/openapitools/model/XmlItem.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/pom.xml b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/pom.xml
index eb5c42b58b7c..b30c55b556cb 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/pom.xml
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/pom.xml
@@ -23,6 +23,7 @@
     <javax.ws.rs-version>2.1.1</javax.ws.rs-version>
     <javax.annotation-api-version>1.3.2</javax.annotation-api-version>
     <smallrye.rest.client.version>1.2.1</smallrye.rest.client.version>
+    <jackson-databind-nullable-version>0.2.8</jackson-databind-nullable-version>
   </properties>
   <dependencyManagement>
     <dependencies>
@@ -71,6 +72,11 @@
       <version>${smallrye.rest.client.version}</version>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.openapitools</groupId>
+      <artifactId>jackson-databind-nullable</artifactId>
+      <version>${jackson-databind-nullable-version}</version>
+    </dependency>
   </dependencies>
   <build>
     <plugins>
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 40702d24d644..5ec72fd43cc4 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
index 947ecf3bbde2..6b496197c718 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Animal.java
index 7d5f71a35dcb..21d6f7f67c04 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Animal.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index dbdaa9339c72..244c0fd54e48 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 832a8b877823..36396042fe00 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayTest.java
index c14f97efc5ef..76bda8566e3f 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Capitalization.java
index 5b6e54a2e7a8..63653286cba4 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Capitalization.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Cat.java
index d5e980050219..142e6d6af057 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Cat.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Category.java
index 741e0f5cd1cb..fc1ce5cba10f 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Category.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ChildWithNullable.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ChildWithNullable.java
index 411625f7747c..6b27a06f3795 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ChildWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ChildWithNullable.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ClassModel.java
index 9e6f3976d79d..2bf9a8d2660d 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ClassModel.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Client.java
index 3c1d6d2743c5..58d508188fa0 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Client.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/DeprecatedObject.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/DeprecatedObject.java
index 33618eb3db9e..f4a316a3e940 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/DeprecatedObject.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/DeprecatedObject.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Dog.java
index 62874a34729c..94158246c48c 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Dog.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumArrays.java
index f27e8be8420d..53f77982f2d0 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumTest.java
index 1b29fba102b1..d7f76057d53c 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/EnumTest.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
index e5c38374159b..15e4d0098248 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index 96f39136a8ae..78a4d340bd2e 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Foo.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Foo.java
index 38633f57c6fe..566ae49cc2da 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Foo.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Foo.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
index fa942941c71f..6714ad276e59 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FormatTest.java
index dd387c03313d..e9d53acd6f7e 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/FormatTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 75f4273f1e18..dd57b55f350b 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HealthCheckResult.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HealthCheckResult.java
index 886d58d817da..f851935d18a3 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HealthCheckResult.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/HealthCheckResult.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Just a string to inform instance is up and running. Make it nullable in hope to get it as pointer in generated model.
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MapTest.java
index 71e35dfa494a..153bec278423 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MapTest.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 149d149f67cd..9bb20135d8fa 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Model200Response.java
index 731b4c8871ae..a05978cf6c17 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Model200Response.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 6df118716138..18bcfd02d0e5 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelFile.java
index 98e6c52dee7a..330cd92b1f06 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelFile.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelList.java
index 19a4cbf3a0ea..888ef323648c 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelList.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelReturn.java
index a78fa512ad2f..fcbe4cb9821a 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Name.java
index 4599a5475318..f2d4694cd081 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Name.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NullableClass.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NullableClass.java
index 139fa1f6415a..534d6d90a855 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NullableClass.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NullableClass.java
@@ -18,6 +18,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NumberOnly.java
index 71908917ea08..687cdb21e91d 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
index 5dba0a473079..c65c091e37fb 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Order.java
index 95a90b6fabcc..887250adb7d7 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Order.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterComposite.java
index d34ba74d1eff..33a1518e8186 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
index c41aabc07df4..89d5e344ba7c 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ParentWithNullable.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ParentWithNullable.java
index 57e1ea2387f8..fc0723259976 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ParentWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ParentWithNullable.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Pet.java
index 53c740a1b6c2..2945f38d8958 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Pet.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 01a771d67b4f..8642f629d6ba 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/SpecialModelName.java
index 8d9585e812fe..6f0d5eea1752 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Tag.java
index 5d37e523dc2a..83a4c5b6ee36 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/Tag.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 5dd3b4b9b26b..1d19a9822f1c 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/User.java
index 460f6864d40b..6ca3f7e7d45c 100644
--- a/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-quarkus-mutiny/src/gen/java/org/openapitools/model/User.java
@@ -9,6 +9,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-required-and-readonly-property/src/gen/java/org/openapitools/model/ReadonlyAndRequiredProperties.java b/samples/server/petstore/jaxrs-spec-required-and-readonly-property/src/gen/java/org/openapitools/model/ReadonlyAndRequiredProperties.java
index 8a3395a2c5be..7a298680cda6 100644
--- a/samples/server/petstore/jaxrs-spec-required-and-readonly-property/src/gen/java/org/openapitools/model/ReadonlyAndRequiredProperties.java
+++ b/samples/server/petstore/jaxrs-spec-required-and-readonly-property/src/gen/java/org/openapitools/model/ReadonlyAndRequiredProperties.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 4e865a95de22..f7c470f8d3f9 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
index 901f8e365ee3..61da97165a8a 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Animal.java
index 4935b594ef3f..3a4103fe2120 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Animal.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index c1f45b4595ce..dd848e4ff24f 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 1d7b078afbfa..745ad2d226c8 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
index 11b01ca0f861..6a3bb42f6a4e 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Capitalization.java
index 439b51450364..1e0427a0676f 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Capitalization.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Cat.java
index d33ce82f9f6e..c00c850a0a6b 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Cat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Category.java
index 67d73b9eacf0..2bed9af85a1c 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Category.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java
index f5685b1765c9..242fba956ee7 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ClassModel.java
index b57f15a6247f..f1161e1375e1 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ClassModel.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Client.java
index 87dadd60504b..59dc178890e0 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Client.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java
index a73cf2ceabea..0a3b9eb86c06 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Dog.java
index e803eef04547..b7d4e06125a1 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Dog.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
index 50b80bad1a5d..a8f4401a8aa4 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumTest.java
index f58c39c6fa83..d5d3288bc3c3 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/EnumTest.java
@@ -18,6 +18,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
index ef8c84a049c9..650cfb9943fe 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
index 11d86dfa10ac..f242f1913135 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index f32011c66a52..62b205a93c40 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Foo.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Foo.java
index d2e4c42204ee..8e86402eabd2 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Foo.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Foo.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
index 35e2d33836a4..5693c0b6b3c5 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FormatTest.java
index 0ac7783e1214..ff34de08a43b 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/FormatTest.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 7e4ec364cdc3..94b4752532d9 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java
index 23869cd6bd69..edb1636af623 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Just a string to inform instance is up and running. Make it nullable in hope to get it as pointer in generated model.
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MapTest.java
index 8f1afc702e9f..d119662b54b6 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MapTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 9f7b8665865e..6605c542a24e 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Model200Response.java
index 7d0315ad979f..4c116e2c32a8 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Model200Response.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 02d38af538d9..b43fd37bd874 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelFile.java
index ac4bd6d10e4d..f3e6b5005a74 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelFile.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelList.java
index 6609a9b18ddd..f111cffe6db9 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelList.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
index 92d2ad1d9107..9317f57fa093 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Name.java
index caafb9babe9d..cdda2cf5482a 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Name.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NullableClass.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NullableClass.java
index 1a7656015918..7d199112f77c 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NullableClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NullableClass.java
@@ -21,6 +21,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
index df0d78161e74..077afd8234de 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
index 9c32a4959a62..8f4c65fa4bb2 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Order.java
index 1d6ed3bf20be..9d5e6330b30d 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Order.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
index b1d099d0db4f..95c85dceea98 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
index bfc0d133ac75..712d30b77fe2 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java
index 5a80b5cabfb1..1cdda43df831 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Pet.java
index 5bd95c1f88cf..442c0b2b84cc 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Pet.java
@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 6dc5d80381bb..4ba6a73c1286 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
index a09dfe8f75d5..421d27f2ee7b 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Tag.java
index e86fa3376597..f4c7d421dcb3 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/Tag.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 2abbdcc5634b..178dfce09f1a 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/User.java
index 5b25269f2432..97ee27c17eb6 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-annotations/src/gen/java/org/openapitools/model/User.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 572a9047c853..309ec1766a1b 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
index 17cf3b463527..3c332b951149 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Animal.java
index 58f03001a091..22e3a9a2c072 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Animal.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index 56f450820cdf..470943a88cfd 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 510b41b48cf1..1abf53ae119a 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java
index c4e3c9f0c461..8586db31195b 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Capitalization.java
index 1afe1773507f..e2198be4a6f0 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Capitalization.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Cat.java
index a3a1cc80f042..02178e775170 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Cat.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Category.java
index 4fdb24f7f44c..be8411135568 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Category.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ChildWithNullable.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ChildWithNullable.java
index 57097d65fa75..34674289ea73 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ChildWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ChildWithNullable.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ClassModel.java
index c3efb9f5891a..3a01cdeaff69 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ClassModel.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Client.java
index 200395b16f58..dccbed3e3bca 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Client.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/DeprecatedObject.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/DeprecatedObject.java
index e316c80794c8..b30944324bda 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/DeprecatedObject.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/DeprecatedObject.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Dog.java
index fd0386dd4e50..f17e5ed59734 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Dog.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java
index 393f627ed9bd..2031c52e1f50 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumTest.java
index 9e49ad8e7060..333d23562a3e 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/EnumTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
index 3e1be0fc9cb1..148d42003b05 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
index 04b9f8e8cfbe..1c8520656e63 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index 28ee5c23b271..0c1e058a6812 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Foo.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Foo.java
index a7a3387c5593..1fd1ce9dc5a0 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Foo.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Foo.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
index c08f51b6ac1a..415bfde0e23e 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FormatTest.java
index 4b778c9dff4f..ad2c61a2e3d5 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/FormatTest.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 097f215e4002..2db9e6aba643 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HealthCheckResult.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HealthCheckResult.java
index 7239283a0895..d8f55c8f3ecc 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HealthCheckResult.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/HealthCheckResult.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Just a string to inform instance is up and running. Make it nullable in hope to get it as pointer in generated model.
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MapTest.java
index 4ff129e77d26..3e77c023a8bc 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MapTest.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 83520d738599..31ecec95b67a 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Model200Response.java
index 1ee640912918..6471ef849cea 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Model200Response.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java
index ba8efa0a16a1..77690ce342ae 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelFile.java
index f813e6b9c2fe..2dfb5337db85 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelFile.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelList.java
index 715a840e82d9..ce1ec42af48c 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelList.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java
index 6382984af112..15406f9338b3 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Name.java
index 3e3abc2fa325..1a14436ca0d6 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Name.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NullableClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NullableClass.java
index 4d131695e54b..cb88b0552858 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NullableClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NullableClass.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java
index 75e682baf206..af02b7c331cf 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
index 849a00776b54..9600b305b802 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Order.java
index 887639544ff0..70c80eb4a4bb 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Order.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java
index 4252a318c02e..71cd6c81e5ef 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
index 8f9c2b9eb2c9..b0a6380e7ca8 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ParentWithNullable.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ParentWithNullable.java
index 0204c0dbf136..91cbef941a43 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ParentWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ParentWithNullable.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Pet.java
index 6e8fe3cb22a6..07f4c68c43c7 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Pet.java
@@ -18,6 +18,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index df92ae9af53c..afbed06cf1b5 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java
index 88f1e41fc8b0..b55a43fc9361 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Tag.java
index e94bf00580af..0886c88025cd 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/Tag.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
index c68f26ff2c58..ad1d7b188b1d 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/User.java
index 1cf8c6524290..462f41a18155 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations-jakarta/src/gen/java/org/openapitools/model/User.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 09556eb4391a..fd3d9e3e9393 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
index 9a9d2013d449..387588b8736b 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Animal.java
index c531dafe3d43..338e02cd619b 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Animal.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index 847d3bbb882d..4dc81f655861 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 29ea779583ad..1601097f3d14 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
index 6e6e9d3dd2fc..225b017339e8 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Capitalization.java
index 9ea63b2d30b2..9907424402d2 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Capitalization.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Cat.java
index dcb069429389..5c386ce967c8 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Cat.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Category.java
index 28e68450d531..032943f0afe3 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Category.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java
index 8f15e6f0df51..66df38d7b21c 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ChildWithNullable.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ClassModel.java
index 65b40894b7e2..9e0b2137b5d0 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ClassModel.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Client.java
index 2002b99e32ca..57f78f42a3b5 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Client.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java
index d46a439df2f6..c58e0110332e 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/DeprecatedObject.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Dog.java
index e4dad61f7a19..83716dcaae8d 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Dog.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
index cca78144e5e6..0175f284c42c 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumTest.java
index d1774f19ef5f..80b2ba4438d4 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/EnumTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
index aafda9f9fe9c..9a06c02555ba 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
index 3d236bb4b425..ddbaa498133f 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index b0808a981f93..d56b9ed6ad73 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Foo.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Foo.java
index e999fb79b983..89cc8b8a4e96 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Foo.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Foo.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
index b4fbcdd7c0dc..c0380ba424ff 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FormatTest.java
index 467a85e0a423..16c107c67cec 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/FormatTest.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 04b430103b61..4e561374f318 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java
index c3faaee75882..a91550d37175 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/HealthCheckResult.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Just a string to inform instance is up and running. Make it nullable in hope to get it as pointer in generated model.
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MapTest.java
index d2c47955a0d2..30c89d4c40f0 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MapTest.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 7794077e6950..3edafaf21313 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Model200Response.java
index db2848fd996f..dae1b08dceec 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Model200Response.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 3512064eebc5..715a93398a24 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelFile.java
index 6481a56724dd..e0185c8c1586 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelFile.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelList.java
index 0418b0742f00..e151c39830c5 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelList.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
index 21708ddb78ab..f5bb1be67757 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Name.java
index 1093dc026082..244639c4dd3a 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Name.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NullableClass.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NullableClass.java
index ba7ab0f5d832..63729f654f09 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NullableClass.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NullableClass.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
index 1057c0ba31d3..7726d26b66e1 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
index a28d3f2cc723..86fbf10fac67 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Order.java
index 0d738476e0a6..6c9bb0379812 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Order.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
index 9051eb76d6e8..efe8c63e196c 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
index 626633b65567..2c128abc8221 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java
index 750ba0cf47da..6f37b8bf94ef 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ParentWithNullable.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Pet.java
index 97fe2ac5e797..e4e0489343ed 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Pet.java
@@ -18,6 +18,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 396374dc05b8..0cd782df0d24 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
index f0fd3e255295..1262eaf5ff23 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -11,6 +11,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Tag.java
index 8ca87aec0bea..395a7c772d12 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/Tag.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 896f32091319..a904d206a846 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/User.java
index 20dbdeb5f03a..4599f1e1cab5 100644
--- a/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-swagger-v3-annotations/src/gen/java/org/openapitools/model/User.java
@@ -10,6 +10,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index b0112272188b..476ce9735f95 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
index ff7b4b849b87..d733cdcc0b2c 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Animal.java
index 1e51578c92b3..419129cd5b83 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Animal.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index 160c40a0002d..3e2f3561506b 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 38affc5bee96..9e6dfb7546dc 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayTest.java
index 51c24fe39669..4f639f59a33f 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Capitalization.java
index b6d4551c2966..2917779e645f 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Capitalization.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Cat.java
index 40eddab12395..e463f0da2a0d 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Cat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Category.java
index 352d2245b302..101df56e1b58 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Category.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ChildWithNullable.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ChildWithNullable.java
index 8f25ab246b68..2ee1dab2d1fd 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ChildWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ChildWithNullable.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ClassModel.java
index 301f33cc7f26..43d7da74d128 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ClassModel.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Client.java
index fc12d27f79cf..b038d2730e50 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Client.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/DeprecatedObject.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/DeprecatedObject.java
index 9867306240a0..f38ad69247b4 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/DeprecatedObject.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/DeprecatedObject.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Dog.java
index 48c03e57f130..4e8c0fece18c 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Dog.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumArrays.java
index 5e8003fe70b1..6804d973173c 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumTest.java
index 313af00d83ab..f21e142ef670 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/EnumTest.java
@@ -18,6 +18,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
index 071cd06126c6..e00834b4049c 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
index 612b51293339..6e00e3aaba20 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index 89541d0dda1b..847a39781e05 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Foo.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Foo.java
index bfd3240799bc..13bdd6e6ee95 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Foo.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Foo.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
index bd0883ce1d81..f42a91848b0d 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FormatTest.java
index d7eff7f35e74..4f0187b97d4c 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/FormatTest.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 21e6fb424447..73bc2cd4c01c 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HealthCheckResult.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HealthCheckResult.java
index fe734f0fecf0..5823cd05aed3 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HealthCheckResult.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/HealthCheckResult.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MapTest.java
index ca2d7d972ac2..01f93f9c1969 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MapTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index f6dbb6935135..c3a730c1788b 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Model200Response.java
index dc587602089a..4bb5907a9006 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Model200Response.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelApiResponse.java
index b32311654a66..f6ce938c2bc0 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelFile.java
index cceba2d54c26..ba48b3c0c3a1 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelFile.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelList.java
index a30e18e5d83a..0aca9f01a0a1 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelList.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelReturn.java
index 56aec3fee3b4..afcd124d6a5f 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Name.java
index 72f1ee71c7c3..56b4c82ec864 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Name.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NullableClass.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NullableClass.java
index 61071a2b01b1..978238ca13ce 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NullableClass.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NullableClass.java
@@ -21,6 +21,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NumberOnly.java
index 8a081eefeac3..7218355549db 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
index be0005e990d0..ff7d09b37c7d 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Order.java
index ea619a01c5a1..c660f33ca588 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Order.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterComposite.java
index 016dcfc8265d..fcdbda850bc2 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
index 2c2192ab0d14..c701792532da 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ParentWithNullable.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ParentWithNullable.java
index 1cd3cbda8594..666a833ed1d8 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ParentWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ParentWithNullable.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Pet.java
index 9ea31032a62d..aab465707085 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Pet.java
@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 34f70db15b4c..d6231bbcf81d 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/SpecialModelName.java
index 61785548efcd..605df25bc497 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Tag.java
index 7cff66b843e1..94875a2ac34b 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/Tag.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
index ef8ec186cf8d..f97029130a70 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/User.java
index 745e1e2161c9..e1b5be012d10 100644
--- a/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec-withxml/src/gen/java/org/openapitools/model/User.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 import javax.xml.bind.annotation.XmlElement;
 import javax.xml.bind.annotation.XmlRootElement;
 import javax.xml.bind.annotation.XmlAccessType;
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
index 4e865a95de22..f7c470f8d3f9 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AdditionalPropertiesClass.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
index 901f8e365ee3..61da97165a8a 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/AllOfWithSingleRef.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Animal.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Animal.java
index 4935b594ef3f..3a4103fe2120 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Animal.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Animal.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "className", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
index c1f45b4595ce..dd848e4ff24f 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
index 1d7b078afbfa..745ad2d226c8 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayOfNumberOnly.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayTest.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayTest.java
index 11b01ca0f861..6a3bb42f6a4e 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayTest.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ArrayTest.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Capitalization.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Capitalization.java
index 439b51450364..1e0427a0676f 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Capitalization.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Capitalization.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Cat.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Cat.java
index d33ce82f9f6e..c00c850a0a6b 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Cat.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Cat.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Category.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Category.java
index 67d73b9eacf0..2bed9af85a1c 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Category.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Category.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ChildWithNullable.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ChildWithNullable.java
index f5685b1765c9..242fba956ee7 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ChildWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ChildWithNullable.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ClassModel.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ClassModel.java
index b57f15a6247f..f1161e1375e1 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ClassModel.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ClassModel.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model with \&quot;_class\&quot; property
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Client.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Client.java
index 87dadd60504b..59dc178890e0 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Client.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Client.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/DeprecatedObject.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/DeprecatedObject.java
index a73cf2ceabea..0a3b9eb86c06 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/DeprecatedObject.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/DeprecatedObject.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Dog.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Dog.java
index e803eef04547..b7d4e06125a1 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Dog.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Dog.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumArrays.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumArrays.java
index 50b80bad1a5d..a8f4401a8aa4 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumArrays.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumArrays.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumTest.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumTest.java
index f58c39c6fa83..d5d3288bc3c3 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumTest.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/EnumTest.java
@@ -18,6 +18,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
index ef8c84a049c9..650cfb9943fe 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeBigDecimalMap200Response.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
index 11d86dfa10ac..f242f1913135 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FakeTestsDefaultsDefaultResponse.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FileSchemaTestClass.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
index f32011c66a52..62b205a93c40 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FileSchemaTestClass.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Foo.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Foo.java
index d2e4c42204ee..8e86402eabd2 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Foo.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Foo.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
index 35e2d33836a4..5693c0b6b3c5 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FooGetDefaultResponse.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FormatTest.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FormatTest.java
index 0ac7783e1214..ff34de08a43b 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FormatTest.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/FormatTest.java
@@ -19,6 +19,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
index 7e4ec364cdc3..94b4752532d9 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HasOnlyReadOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HealthCheckResult.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HealthCheckResult.java
index 23869cd6bd69..edb1636af623 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HealthCheckResult.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/HealthCheckResult.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Just a string to inform instance is up and running. Make it nullable in hope to get it as pointer in generated model.
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MapTest.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MapTest.java
index 8f1afc702e9f..d119662b54b6 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MapTest.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MapTest.java
@@ -14,6 +14,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
index 9f7b8665865e..6605c542a24e 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/MixedPropertiesAndAdditionalPropertiesClass.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Model200Response.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Model200Response.java
index 7d0315ad979f..4c116e2c32a8 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Model200Response.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Model200Response.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name starting with number
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelApiResponse.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelApiResponse.java
index 02d38af538d9..b43fd37bd874 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelApiResponse.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelApiResponse.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelFile.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelFile.java
index ac4bd6d10e4d..f3e6b5005a74 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelFile.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelFile.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Must be named &#x60;File&#x60; for test.
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelList.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelList.java
index 6609a9b18ddd..f111cffe6db9 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelList.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelList.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelReturn.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelReturn.java
index 92d2ad1d9107..9317f57fa093 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelReturn.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ModelReturn.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing reserved words
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Name.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Name.java
index caafb9babe9d..cdda2cf5482a 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Name.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Name.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 /**
  * Model for testing model name same as property name
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NullableClass.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NullableClass.java
index 1a7656015918..7d199112f77c 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NullableClass.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NullableClass.java
@@ -21,6 +21,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NumberOnly.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NumberOnly.java
index df0d78161e74..077afd8234de 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NumberOnly.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/NumberOnly.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
index 9c32a4959a62..8f4c65fa4bb2 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ObjectWithDeprecatedFields.java
@@ -17,6 +17,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Order.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Order.java
index 1d6ed3bf20be..9d5e6330b30d 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Order.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Order.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterComposite.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterComposite.java
index b1d099d0db4f..95c85dceea98 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterComposite.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterComposite.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
index bfc0d133ac75..712d30b77fe2 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/OuterObjectWithEnumProperty.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ParentWithNullable.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ParentWithNullable.java
index 5a80b5cabfb1..1cdda43df831 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ParentWithNullable.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ParentWithNullable.java
@@ -16,6 +16,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type", visible = true)
 @JsonSubTypes({
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Pet.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Pet.java
index 5bd95c1f88cf..442c0b2b84cc 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Pet.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Pet.java
@@ -20,6 +20,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ReadOnlyFirst.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
index 6dc5d80381bb..4ba6a73c1286 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/ReadOnlyFirst.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/SpecialModelName.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/SpecialModelName.java
index a09dfe8f75d5..421d27f2ee7b 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/SpecialModelName.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/SpecialModelName.java
@@ -13,6 +13,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Tag.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Tag.java
index e86fa3376597..f4c7d421dcb3 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Tag.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/Tag.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
index 2abbdcc5634b..178dfce09f1a 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/TestInlineFreeformAdditionalPropertiesRequest.java
@@ -15,6 +15,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;
 
 
 
diff --git a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/User.java b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/User.java
index 5b25269f2432..97ee27c17eb6 100644
--- a/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/User.java
+++ b/samples/server/petstore/jaxrs-spec/src/gen/java/org/openapitools/model/User.java
@@ -12,6 +12,7 @@
 import com.fasterxml.jackson.annotation.JsonCreator;
 import com.fasterxml.jackson.annotation.JsonValue;
 import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.openapitools.jackson.nullable.JsonNullable;