Just a note that I think this problem is more directly related to Trinidad + A4J than it is to tomahawk. I've read elsewhere that re-ordering the web.xml (to adhere to the spec) may help but that has not resolved this issue. Removing the following from faces-config.xml get's rid of the error, but of course Trinidad components no longer work. <default-render-kit-id>org.apache.myfaces.trinidad.core</default-render-kit-id> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3996641#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...