Thanks, man. Exactly that was the problem. I had to download the jar suggested by nabble and the problem disappeared! View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4214409#4214409 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4214409