To solve the problem of having our two JSF portlets (core-admin and core-wsrp) work on both JBoss AS 4.0.5 (with embedded myFaces) and JBoss AS 4.2.0 (with embedded Sun RI JSF implementation), we came up with a "MetaBridge" http://wiki.jboss.org/wiki/Wiki.jsp?page=PortalJSFMetaBridge While it worked well for our portlets, it brought a load of other issues for other portlets deployment as the core-admin (and core-wsrp) is not isolated (other portlets trying to start the meta-bridge, people willing to use myFaces instead of Sun RI...) One option would be to include the myFaces implementation inside the core-admin.sar package and isolate the sar in its own classloader, i didn't succeed unfortunately, not sure why. So the safest way would be to only support JBoss 4.2.0 and Sun RI (despite the current low quality of the portlet bridge). Thoughts ? Any idea ? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4062360#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...