You can run jsf 1.2 ri on jboss 4.0.5 because I do. Here is the caveat, jboss 4.0.5 ships with the tomcat 5.5.x sar which is jsp 2.0 compliant not jsp 2.1 which i think you need for jsf 1.2. just nav to http://juel.sourceforge.net/ and snag their latest api & impl for the java unified expression langauge and add it to your ear as a regular java module. i haven't seen any side effects. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4014436#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...