It works fine finally. The most important thing is that both myfaces jar files have to be put into JBOSS lib directory instead of the war file. Otherwise, the StartupContextPhaseListener will pick up the ApplicationFactory class instead of SeamApplicationFactory and it leads to fail to instantiate user Seam component. This is most important. Unfortunately, the JBOSS Seam document did not mention this point. I am very sorry for this missing. Benson View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4077878#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...