I'm pretty sure this is a classloader issue. I think there's a Seam FAQ out somewhere that addresses this. I'm on the run, but poke around a little more. I'm pretty sure this has been answered. JBoss has a number of classloader options, it also ships with a JSF implementation so your inclusion of MyFaces shouldn't be necessary. * Try removing MyFaces from your deployable. * Try removing MyFaces from it's default location within JBoss. * Change the classloader params for JBoss to provide the isolation level you require. * Wait for further help, sry I only have 30sec for this message. :) View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3974034#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...