--- frameworks/python/src/ladon/interfaces/jsonrpc10.py	2012-10-30 14:18:38 +0000
+++ frameworks/python/src/ladon/interfaces/jsonrpc10.py	2013-05-03 13:56:08 +0000
@@ -145,9 +145,13 @@
 			raise RequestParamsArrayFault(passback_dict)
 		params_len = len(params) if params is not None else 0
 		args_len = len(minfo.args())
-		if params_len == 0 and  args_len> 0:
+		optional = 0
+                for arg in minfo.args():
+                    if arg['optional']:
+			optional = optional + 1
+		if params_len == 0 and  args_len - optional > 0:
 			raise RequestParamFault(minfo.args()[0]['name'],passback_dict)
-		elif params_len < args_len:
+		elif params_len < args_len - optional:
 			raise RequestParamFault(minfo.args()[params_len]['name'],passback_dict)
 		elif params_len > args_len:
 			raise MethodArgsCountFault(req_dict['method'], args_len, params_len,passback_dict)