Use MyFaces 1.2. That exception suggests to me that you've still got conflicting jsf implementations in JBoss AS. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4105239#4105239 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4105239