On the server side i've working with JDK1.6, as same as client side. I tried use 1.5 on the client side but the problem still remain. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127885#4127885 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4127885