You also need to add the jboss.home/client/javassist.jar to the classpath. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4049937#4049937 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4049937