What JBoss version are you using? Try using JBoss 4.0.5 and don't add myfaces library in WEB-INF/lib. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4101132#4101132 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4101132