diff --git a/src/main/java/com/loafle/commons/rpc/RPCException.java b/src/main/java/com/loafle/commons/rpc/RPCException.java
index 5e83be5..9584b50 100644
--- a/src/main/java/com/loafle/commons/rpc/RPCException.java
+++ b/src/main/java/com/loafle/commons/rpc/RPCException.java
@@ -4,5 +4,19 @@ package com.loafle.commons.rpc;
  * RPCException
  */
 public class RPCException extends Exception {
+  private Object data;
+  
+  public RPCException(String message) {
+    super(message);
+  }
 
+  public RPCException(String message, Object data) {
+    super(message);
+
+    this.data = data;
+  }
+
+  public Object getData() {
+    return this.data;
+  }
 }
diff --git a/src/main/java/com/loafle/commons/rpc/protocol/RPCServerRequestCodec.java b/src/main/java/com/loafle/commons/rpc/protocol/RPCServerRequestCodec.java
index 2d83db5..3887273 100644
--- a/src/main/java/com/loafle/commons/rpc/protocol/RPCServerRequestCodec.java
+++ b/src/main/java/com/loafle/commons/rpc/protocol/RPCServerRequestCodec.java
@@ -7,5 +7,5 @@ import com.loafle.commons.rpc.RPCException;
  */
 public interface RPCServerRequestCodec extends RPCRegistryCodec {
   boolean hasResponse();
-  byte[] response(Object reply, Error error) throws RPCException;
+  byte[] response(Object reply, RPCException error) throws RPCException;
 }
\ No newline at end of file
diff --git a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCServerRequestCodec.java b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCServerRequestCodec.java
index 71cf544..891e0a2 100644
--- a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCServerRequestCodec.java
+++ b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONRPCServerRequestCodec.java
@@ -17,10 +17,11 @@ class JSONRPCServerRequestCodec implements RPCServerRequestCodec {
 
   public JSONRPCServerRequestCodec(Gson gson, byte[] buff) throws RPCException {
     this.gson = gson;
+    String json = new String(buff);
     try {
-      this.request = this.gson.fromJson(new String(buff), JSONServerRequest.class);
+      this.request = this.gson.fromJson(json, JSONServerRequest.class);
     } catch (JsonSyntaxException e) {
-      e.printStackTrace();
+      throw new RPCException("request is not valied", json);
     }
   }
 
@@ -34,11 +35,11 @@ class JSONRPCServerRequestCodec implements RPCServerRequestCodec {
     }
 
     if ((null != paramTypes && null == this.request.params) || null == paramTypes && null != this.request.params) {
-      throw new RPCException();
+      throw new RPCException("params is not valied");
     }
 
     if (paramTypes.length != this.request.params.size()) {
-      throw new RPCException();
+      throw new RPCException(String.format("The size of params[%d] and types[%d] is not same", this.request.params.size(), paramTypes.length));
     }
 
     Object[] result = new Object[paramTypes.length];
@@ -57,10 +58,10 @@ class JSONRPCServerRequestCodec implements RPCServerRequestCodec {
     return null != this.request.id;
   }
 
-  public byte[] response(Object reply, Error error) throws RPCException {
+  public byte[] response(Object reply, RPCException ex) throws RPCException {
     RPCError rpcError = null;
-    if (null != error) {
-      rpcError = new RPCError(1, "", error);
+    if (null != ex) {
+      rpcError = new RPCError(1, ex.getMessage(), ex.getData());
     }
     JSONServerResponse response = new JSONServerResponse(JSONRPC.version, reply, rpcError);
     response.id = this.request.id;
diff --git a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerNotification.java b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerNotification.java
index 7015702..b5a94e5 100644
--- a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerNotification.java
+++ b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerNotification.java
@@ -6,10 +6,7 @@ import com.google.gson.annotations.SerializedName;
  * JSONServerNotification
  */
 class JSONServerNotification {
-  @SerializedName("method")
   public String method;
-
-  @SerializedName("params")
   public Object[] params;
 
   JSONServerNotification(String method, Object[] params) {
diff --git a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerRequest.java b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerRequest.java
index bbc18de..963a1a7 100644
--- a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerRequest.java
+++ b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerRequest.java
@@ -10,14 +10,8 @@ import com.google.gson.annotations.SerializedName;
 class JSONServerRequest {
   @SerializedName("jsonrpc")
   public String version;
-
-  @SerializedName("method")
   public String method;
-
-  @SerializedName("params")
   public List<String> params;
-
-  @SerializedName("id")
   public Object id;
 
 }
\ No newline at end of file
diff --git a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerResponse.java b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerResponse.java
index ffc76e0..1c13db9 100644
--- a/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerResponse.java
+++ b/src/main/java/com/loafle/commons/rpc/protocol/json/JSONServerResponse.java
@@ -10,13 +10,8 @@ class JSONServerResponse {
   @SerializedName("jsonrpc")
   public String version;
 
-  @SerializedName("result")
   public Object result;
-
-  @SerializedName("error")
   public RPCError error;
-
-  @SerializedName("id")
   public Object id;
 
   JSONServerResponse(String version, Object result, RPCError error) {
diff --git a/src/main/java/com/loafle/commons/rpc/registry/RPCRegistry.java b/src/main/java/com/loafle/commons/rpc/registry/RPCRegistry.java
index 3bc52ee..d555d37 100644
--- a/src/main/java/com/loafle/commons/rpc/registry/RPCRegistry.java
+++ b/src/main/java/com/loafle/commons/rpc/registry/RPCRegistry.java
@@ -12,4 +12,4 @@ public interface RPCRegistry extends RPCInvoker {
 	void registerService(Object receiver, String name) throws RPCException;
 	void registerServices(Object... receivers) throws RPCException;
 	void registerServices(Map<String, Object> receivers) throws RPCException;
-}
\ No newline at end of file
+}