You are bundling the JSF implementation with your WAR. This is causing a conflict with the implementation that ships with JBoss. Starting with JBoss AS 4.0.3, we bundle a JSF implementation with the app server. For the 4.x series the implementation is MyFaces. For 5.x, the implementation is the Glassfish/CDDL JSF 1.2 implementation. See http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossFaces You can either remove the JSF implementation from your WAR or you can disable the one that ships with JBoss. See the section on "Using the JSF Reference Implementation" on this page: http://wiki.jboss.org/wiki/Wiki.jsp?page=JBossWithIntegratedMyFaces View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3977516#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...