Yeah, I hit the same thing not long ago. Look carefully at the package names: tried to access field org.jboss.seam.web.Ajax4jsfFilter.del | egate from class org.jboss.seam.ui.filter.Ajax4jsfFilter. I don't remember the exact fix, but I think it was that I referred to the wrong filter in one of the config files. Regardless the above is probably the clue you want to follow though. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4068572#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...