fix jackson annotation JsonUnwrapped compatible, for issue #2846

core/src/main/java/com/alibaba/fastjson2/util/BeanUtils.java

@@ -1125,6 +1125,7 @@ private static boolean isJSONField(AnnotatedElement element) {
                 case "com.fasterxml.jackson.annotation.JsonValue":
                 case "com.fasterxml.jackson.annotation.JsonRawValue":
                 case "com.fasterxml.jackson.annotation.JsonProperty":
+                case "com.fasterxml.jackson.annotation.JsonUnwrapped":
                     if (JSONFactory.isUseJacksonAnnotation()) {
                         return true;
                     }

core/src/test/java/com/alibaba/fastjson2/issues_2800/Issue2846.java

@@ -0,0 +1,31 @@
+package com.alibaba.fastjson2.issues_2800;
+
+import com.alibaba.fastjson2.JSON;
+import com.fasterxml.jackson.annotation.JsonUnwrapped;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class Issue2846 {
+    @Test
+    public void testFastJson() throws Exception {
+        CombineView combineView = new CombineView();
+        String jacksonResult = new ObjectMapper().writeValueAsString(combineView);
+        String fastjsonResult = JSON.toJSONString(new CombineView());
+        assertEquals(jacksonResult, fastjsonResult);
+    }
+
+    static class CombineView {
+        @JsonUnwrapped
+        public View1 author() {
+            return new View1();
+        }
+    }
+
+    static class View1 {
+        public String getAuthorName() {
+            return "name";
+        }
+    }
+}