Ok, I'm running plain vanilla JBoss 4.0.5 with whatever Tomcat it comes with, meaning that I'm using JSP 2.0, so that shouldn't be a problem. &quot;norman.richards(a)jboss.com&quot; wrote : Oh, and Facelets is trivial to set up. Have a look at the examples. I would NEVER go back to plain JSPs unless forced to. Here's what I tried: I put the following in my faces-config.xml: <application> | <view-handler>org.jboss.seam.ui.facelet.SeamFaceletViewHandler</view-handler> | </application> | which should just activate the Seam view handler, right? But then I get these exceptions: Exception sending context initialized event to listener instance of class org.apache.myfaces.webapp.StartupServletContextListener | java.lang.NoClassDefFoundError: com/sun/facelets/FaceletViewHandler So I assume that if I put the right jars into my WEB-INF/lib, that would solve that exception, right? Any suggestions on which jars? Do I need to remove any jars from JBoss or do anything like that? Thanks View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996242#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...