Hi. I had the same problem, and finally solved it. In my case, the problem seemed to be caused by the jar construction. In my build.xml file I had the following tag: The problem solved when I removed the basedir parameter: Somehow, the basedir attribute seemed to be duplicating the classes, although I couldn't see any duplicated class on the jar file. Juan Manuel View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4122446#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...