Looks like a classloading issue. See if this helps http://wiki.jboss.org/wiki/InvalidPackagingError View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4177617#4177617 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4177617