fix(java): Add @JsonIgnore to non-serialization getters for nullables (#6380)

* fix(java): Add @JsonIgnore to non-serialization getters for nullables

* run unions fixtures

* add changelog version

---------

Co-authored-by: Alberto <alberto@buildwithfern.com>

Author: ajgateno

generators/java/generator-utils/src/main/java/com/fern/java/generators/object/EnrichedObjectProperty.java

@@ -1,5 +1,6 @@
 package com.fern.java.generators.object;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
 import com.fasterxml.jackson.annotation.JsonInclude;
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fern.ir.model.commons.Name;
@@ -107,6 +108,8 @@ public Void _visitUnknown(Object unknownType) {
             getterBuilder.addAnnotation(AnnotationSpec.builder(JsonProperty.class)
                     .addMember("value", "$S", wireKey().get())
                     .build());
+        } else {
+            getterBuilder.addAnnotation(AnnotationSpec.builder(JsonIgnore.class).build());
         }
         if (fromInterface() && !inline()) {
             getterBuilder.addAnnotation(ClassName.get("", "java.lang.Override"));

generators/java/sdk/versions.yml

@@ -1,3 +1,10 @@
+- changelogEntry:
+    - summary: |
+        Add @JsonIgnore to non-serialization getters for nullables
+      type: fix
+  createdAt: '2025-03-11'
+  irVersion: 55
+  version: 2.24.1
 - changelogEntry:
     - summary: |
         Fix wrapped request paths in flat mode