Hi I have the same problem I have done that using the wstools ant task and not able to foung how to add this mapping and package up it in the war file so my deserialize error is removed. so what to do please help me out. Tools I am using : JBoss 4.0.5 GA and wstools for the same version JDK1.5.06 Ant 1.6.5 My Ant file is following : <ws2tools dest="${base}/WEB-INF" config="${base}/wstools-config.xml" includes="${base}/service/classes" classpathref="lib.path" > </ws2tools> when i supplied the needed wstools-config.xml and web.xml the Ant task will generate the needed jax-rpc_mapping.xml and webservices.xml and wsdl file for the service When I run the client it will work fine for the operaion that not returns the value means void and If i use the operation that will return value means String than it will give no deserializer found error so likely the same problem you have. So please help me to come out of that spend several days to for the solution. Regards, Rahul View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4085345#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...