fix: address cubic-dev-ai review comments

- Remove {{^-first}} to include ALL responses in errorType map (not just from 2nd response)
- Add transient keyword to errorEntity field for serialization safety
- Update test to expect transient keyword
- Regenerate samples with fixes

Author: Chhida

modules/openapi-generator/src/main/resources/Java/libraries/jersey3/api.mustache

@@ -197,11 +197,9 @@ public class {{classname}} {
     {{/hasAuthMethods}}
     final Map<String, GenericType> localVarErrorTypes = new HashMap<String, GenericType>();
     {{#responses}}
-    {{^-first}}
     {{#dataType}}
     localVarErrorTypes.put("{{code}}", new GenericType<{{{dataType}}}>() {});
     {{/dataType}}
-    {{/-first}}
     {{/responses}}
     {{#returnType}}
     GenericType<{{{returnType}}}> localVarReturnType = new GenericType<{{{returnType}}}>() {};

modules/openapi-generator/src/main/resources/Java/libraries/jersey3/apiException.mustache

@@ -20,7 +20,7 @@ public class ApiException extends{{#useRuntimeException}} RuntimeException {{/us
     private int code = 0;
     private Map<String, List<String>> responseHeaders = null;
     private String responseBody = null;
-    private Object errorEntity = null;
+    private transient Object errorEntity = null;
 
     public ApiException() {}
 

modules/openapi-generator/src/test/java/org/openapitools/codegen/java/jersey3/JavaJersey3ErrorEntityFunctionalTest.java

@@ -50,8 +50,8 @@ public void testGeneratedApiExceptionHasErrorEntity() throws Exception {
         String template = readTemplate("apiException.mustache");
         assertNotNull(template);
 
-        // Verify errorEntity field exists
-        assertTrue(template.contains("private Object errorEntity = null"),
+        // Verify errorEntity field exists (transient for serialization safety)
+        assertTrue(template.contains("private transient Object errorEntity = null"),
             "Generated ApiException should have errorEntity field");
 
         // Verify getErrorEntity() method exists

samples/client/petstore/java/jersey3-oneOf/pom.xml

@@ -358,6 +358,7 @@
         <commons-lang3-version>3.12.0</commons-lang3-version>
         <http-signature-version>1.8</http-signature-version>
         <junit-version>5.10.0</junit-version>
+        <junit-version>5.10.0</junit-version>
         <spotless.version>2.21.0</spotless.version>
     </properties>
 </project>