fix remove the field writer which only differ in first character that…

… one is upper case the other is lower case, for issue 3220
alibaba · Dec 25, 2024 · e370739 · e370739
1 parent 2947043
commit e370739
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diff --git a/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterCreator.java b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterCreator.java
@@ -479,6 +479,14 @@ boolean record = BeanUtils.isRecord(objectClass);
                     if (origin != null && origin.compareTo(fieldWriter) > 0) {
                         fieldWriterMap.put(fieldName, fieldWriter);
                     }
+
+                    // the sameFieldName means only differ in first character that one is upper case the other is lower case
+                    if (origin == null) {
+                        String sameFieldName = Character.toUpperCase(fieldName.charAt(0)) + fieldName.substring(1);
+                        if (fieldWriterMap.containsKey(sameFieldName)) {
+                            fieldWriterMap.remove(sameFieldName);
+                        }
+                    }
                 });
 
                 fieldWriters = new ArrayList<>(fieldWriterMap.values());

diff --git a/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterCreatorASM.java b/core/src/main/java/com/alibaba/fastjson2/writer/ObjectWriterCreatorASM.java
@@ -345,6 +345,14 @@ boolean record = BeanUtils.isRecord(objectClass);
                     if (origin != null && origin.compareTo(fieldWriter) > 0) {
                         fieldWriterMap.put(fieldName, fieldWriter);
                     }
+
+                    // the sameFieldName means only differ in first character that one is upper case the other is lower case
+                    if (origin == null) {
+                        String sameFieldName = Character.toUpperCase(fieldName.charAt(0)) + fieldName.substring(1);
+                        if (fieldWriterMap.containsKey(sameFieldName)) {
+                            fieldWriterMap.remove(sameFieldName);
+                        }
+                    }
                 });
             }
         } else {