diff --git a/http-generator-jex/src/main/java/io/avaje/http/generator/jex/ControllerMethodWriter.java b/http-generator-jex/src/main/java/io/avaje/http/generator/jex/ControllerMethodWriter.java
index 60557b0c..c3244def 100644
--- a/http-generator-jex/src/main/java/io/avaje/http/generator/jex/ControllerMethodWriter.java
+++ b/http-generator-jex/src/main/java/io/avaje/http/generator/jex/ControllerMethodWriter.java
@@ -308,9 +308,7 @@ private void writeJsonReturn(String produces) {
       return;
     }
     if (useJsonB) {
-      writer.append(
-        "%sJsonType.toJson(result, ctx.contentType(\"%s\").outputStream());",
-        uType.shortName(), produces);
+      writer.append("ctx.jsonb(%sJsonType, result);", uType.shortName());
     } else {
       writer.append("ctx.json(result);");
     }
diff --git a/tests/pom.xml b/tests/pom.xml
index 6be01999..60b9ae45 100644
--- a/tests/pom.xml
+++ b/tests/pom.xml
@@ -15,7 +15,7 @@
     <junit.version>5.11.4</junit.version>
     <assertj.version>3.27.3</assertj.version>
     <jackson.version>2.18.2</jackson.version>
-    <jex.version>3.0-RC18</jex.version>
+    <jex.version>3.0-RC20</jex.version>
     <avaje-inject.version>11.2</avaje-inject.version>
     <nima.version>4.1.6</nima.version>
     <javalin.version>6.4.0</javalin.version>
diff --git a/tests/test-jex/src/main/resources/public/openapi.json b/tests/test-jex/src/main/resources/public/openapi.json
index e31f0de2..6ce04367 100644
--- a/tests/test-jex/src/main/resources/public/openapi.json
+++ b/tests/test-jex/src/main/resources/public/openapi.json
@@ -1587,20 +1587,10 @@
 				}
 			},
 			"Long>" : {
-				"type" : "object",
-				"properties" : {
-					"value" : {
-						"$ref" : "#/components/schemas/T"
-					}
-				}
+				"type" : "object"
 			},
 			"NestedEnum>" : {
-				"type" : "object",
-				"properties" : {
-					"value" : {
-						"$ref" : "#/components/schemas/T"
-					}
-				}
+				"type" : "object"
 			},
 			"Person" : {
 				"type" : "object",
@@ -1615,14 +1605,6 @@
 				}
 			},
 			"String>" : {
-				"type" : "object",
-				"properties" : {
-					"value" : {
-						"$ref" : "#/components/schemas/T"
-					}
-				}
-			},
-			"T" : {
 				"type" : "object"
 			},
 			"ViewHome" : {