AXIS2-6104 Move shared RPC classes to library-agnostic package

Moved Axis2JsonErrorResponse, JsonRpcFaultException, PaginatedResponse,
and PaginationRequest from org.apache.axis2.json.gson.rpc to
org.apache.axis2.json.rpc — a new shared package that neither gson
nor moshi imports depend on.

Before: moshi.rpc imported gson.rpc classes, creating a misleading
cross-dependency between two implementations that should be independent.

After:
  org.apache.axis2.json.rpc/       ← shared contract (no library imports)
  org.apache.axis2.json.gson.rpc/  ← Gson-specific receivers + JsonUtils
  org.apache.axis2.json.moshi.rpc/ ← Moshi-specific receivers + JsonUtils

Both gson and moshi receivers import from the shared rpc package.
The shared classes contain zero Gson or Moshi imports — they are
plain POJOs serializable by any JSON library.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: robertlazarski

modules/json/src/org/apache/axis2/json/gson/rpc/JsonRpcMessageReceiver.java

@@ -25,6 +25,8 @@
 import org.apache.axis2.description.AxisOperation;
 import org.apache.axis2.json.gson.GsonXMLStreamReader;
 import org.apache.axis2.json.factory.JsonConstant;
+import org.apache.axis2.json.rpc.Axis2JsonErrorResponse;
+import org.apache.axis2.json.rpc.JsonRpcFaultException;
 import org.apache.axis2.rpc.receivers.RPCMessageReceiver;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;

modules/json/src/org/apache/axis2/json/gson/rpc/JsonUtils.java

@@ -29,6 +29,7 @@
 import org.apache.axis2.Constants;
 import org.apache.axis2.context.MessageContext;
 import org.apache.axis2.json.factory.JsonConstant;
+import org.apache.axis2.json.rpc.Axis2JsonErrorResponse;
 
 import java.io.IOException;
 import java.lang.reflect.InvocationTargetException;

modules/json/src/org/apache/axis2/json/moshi/rpc/JsonRpcMessageReceiver.java

@@ -23,8 +23,8 @@
 import org.apache.axis2.Constants;
 import org.apache.axis2.context.MessageContext;
 import org.apache.axis2.description.AxisOperation;
-import org.apache.axis2.json.gson.rpc.Axis2JsonErrorResponse;
-import org.apache.axis2.json.gson.rpc.JsonRpcFaultException;
+import org.apache.axis2.json.rpc.Axis2JsonErrorResponse;
+import org.apache.axis2.json.rpc.JsonRpcFaultException;
 import org.apache.axis2.json.moshi.MoshiXMLStreamReader;
 import org.apache.axis2.json.factory.JsonConstant;
 import org.apache.axis2.rpc.receivers.RPCMessageReceiver;

modules/json/src/org/apache/axis2/json/moshi/rpc/JsonUtils.java

@@ -32,7 +32,7 @@
 import org.apache.axis2.Constants;
 import org.apache.axis2.context.MessageContext;
 import org.apache.axis2.json.factory.JsonConstant;
-import org.apache.axis2.json.gson.rpc.Axis2JsonErrorResponse;
+import org.apache.axis2.json.rpc.Axis2JsonErrorResponse;
 
 import java.io.IOException;
 import java.lang.annotation.Annotation;

…son/gson/rpc/Axis2JsonErrorResponse.java …is2/json/rpc/Axis2JsonErrorResponse.javamodules/json/src/org/apache/axis2/json/gson/rpc/Axis2JsonErrorResponse.java renamed to modules/json/src/org/apache/axis2/json/rpc/Axis2JsonErrorResponse.java modules/json/src/org/apache/axis2/json/gson/rpc/Axis2JsonErrorResponse.java renamed to modules/json/src/org/apache/axis2/json/rpc/Axis2JsonErrorResponse.java

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.axis2.json.gson.rpc;
+package org.apache.axis2.json.rpc;
 
 import java.time.Instant;
 import java.util.UUID;

…json/gson/rpc/JsonRpcFaultException.java …xis2/json/rpc/JsonRpcFaultException.javamodules/json/src/org/apache/axis2/json/gson/rpc/JsonRpcFaultException.java renamed to modules/json/src/org/apache/axis2/json/rpc/JsonRpcFaultException.java modules/json/src/org/apache/axis2/json/gson/rpc/JsonRpcFaultException.java renamed to modules/json/src/org/apache/axis2/json/rpc/JsonRpcFaultException.java

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.axis2.json.gson.rpc;
+package org.apache.axis2.json.rpc;
 
 /**
  * Exception thrown by JSON-RPC service methods to signal a structured error

…is2/json/gson/rpc/PaginatedResponse.java …he/axis2/json/rpc/PaginatedResponse.javamodules/json/src/org/apache/axis2/json/gson/rpc/PaginatedResponse.java renamed to modules/json/src/org/apache/axis2/json/rpc/PaginatedResponse.java modules/json/src/org/apache/axis2/json/gson/rpc/PaginatedResponse.java renamed to modules/json/src/org/apache/axis2/json/rpc/PaginatedResponse.java

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.axis2.json.gson.rpc;
+package org.apache.axis2.json.rpc;
 
 import java.util.Collections;
 import java.util.List;

…is2/json/gson/rpc/PaginationRequest.java …he/axis2/json/rpc/PaginationRequest.javamodules/json/src/org/apache/axis2/json/gson/rpc/PaginationRequest.java renamed to modules/json/src/org/apache/axis2/json/rpc/PaginationRequest.java modules/json/src/org/apache/axis2/json/gson/rpc/PaginationRequest.java renamed to modules/json/src/org/apache/axis2/json/rpc/PaginationRequest.java

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.axis2.json.gson.rpc;
+package org.apache.axis2.json.rpc;
 
 /**
  * Pagination parameters that a client sends with a list query.

…json/gson/rpc/PaginatedResponseTest.java …xis2/json/rpc/PaginatedResponseTest.javamodules/json/test/org/apache/axis2/json/gson/rpc/PaginatedResponseTest.java renamed to modules/json/test/org/apache/axis2/json/rpc/PaginatedResponseTest.java modules/json/test/org/apache/axis2/json/gson/rpc/PaginatedResponseTest.java renamed to modules/json/test/org/apache/axis2/json/rpc/PaginatedResponseTest.java

@@ -17,7 +17,7 @@
  * under the License.
  */
 
-package org.apache.axis2.json.gson.rpc;
+package org.apache.axis2.json.rpc;
 
 import org.junit.Test;
 

modules/samples/userguide/src/userguide/springbootdemo-tomcat11/src/main/java/userguide/springboot/webservices/FinancialBenchmarkService.java

@@ -18,7 +18,7 @@
  */
 package userguide.springboot.webservices;
 
-import org.apache.axis2.json.gson.rpc.JsonRpcFaultException;
+import org.apache.axis2.json.rpc.JsonRpcFaultException;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.springframework.stereotype.Component;