FYI All I had to do to the get the, admittedly trival, numberguess example from Seam 1.1.0.GA running in JBAS 5.0.0.Beta1 was: 1) Add cglib.jar to jboss-seam-numberguess.war\WEB-INF\lib. I have no idea what version of cglib.jar this is, the only interesting thing in the MANIFEST.MF is JarJarStringTransformer: com.tonicsystems.jarjar.GeneratedStringTransformer Its the one which came with jboss-seam-booking.ear which is in the JBAS5 beta download directory (http://sourceforge.net/project/showfiles.php?group_id=22866&package_i...). Any idea which cglib.jar version this is? 2) Update jboss-seam-numberguess.war\WEB-INF\web.xml as follows, replace StartupServletContextListener with ConfigureListener: <listener> | <listener-class>com.sun.faces.config.ConfigureListener</listener-class> | </listener> | <!-- | <listener> <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class> | <listener> | --> Cheers View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3994875#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...