ok it works now.... thanks everybody Causes: 1) The wsdlLocation of my wsdl file was incorrect (wrong machine IP). I redefined it properly 2) Variable Holder sessionId (defined as WebParam.Mode.OUT) should not be allocated in both sides (Server&Client) but only in the client side. And on the server side, just use sessionId.value= "something you want" bye View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4142799#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...