I found it. Exactly the bean metthod is not same as the remote metthod. MutableUser addMobileTagUser(MutableTagUser, int, boolean) throws CodeExceptiont is not same as bean method. In bean class, it used MutableTagUser super class instead of MutableTagUser. But there was no error when we deployed our application in a old ejb container. Is it a bug with the old container? Thanks. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3993225#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...