A lot of Seam libraries contain faces_config.xml which defines some JSF components. See jboss-seam.jar/META-INF View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4207550#4207550 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4207550