No, the jboss-seam.jar should be only in your ear/lib directory. Make sure you have classloading isolation enabled. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4092685#4092685 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4092685