HI, All Tools I have used: JBoss 4.0.5GA wstools shiped with this server Ant 1.6.5 I am developing webservice using the wstools that is shiped with the {JBoss_home}/bin directory I have created simple service that will make addition of two numbers I have created wstools-config.xml file and web.xml file and rest of the files are generated by wstools like jax-rpc_mapping.xml and webservices.xml and the .wsdl file now when I am developing method that return void that works fine for me and when I am developing the method that return any type means String or Int it will throw the error could not find deserializer for the resule where encoding type = null when I am trying to invoke service using client. Please help me to come out of the Problem. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4086444#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...