Aha, I think it means I need to use @Xml(Root)Element on the AdviceData classes View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4230027#4230027 Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&p=4230027