It looks like you included Sun RI JSF implementation libs in your war. look for jsf-impl.jar View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4057554#4057554 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4057554