完善对象的描述信息
diff --git a/dubbo/codec/encoder.py b/dubbo/codec/encoder.py
index e5ed8ba..0b3a408 100644
--- a/dubbo/codec/encoder.py
+++ b/dubbo/codec/encoder.py
@@ -46,7 +46,7 @@
         del self.__values[key]
 
     def __repr__(self):
-        return '<{}>'.format(self.__path)
+        return '<java object {0} at {1}>'.format(self.__path, hex(id(self)))
 
     def __contains__(self, key):
         return key in self.__values