Either that or perhaps there are different versions of the JBM and JBR libs on client and server side. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4234071#4234071 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4234071