I've tried it to no avail. Had jaxws20 app running in Tomcat wihout any problems. Moved it to JBoss 4.0.2 and it complained about saaj*.jar s'. Unfortunately, unified classloader doesnt allow you to load the saaj-impl and saaj jars after the jboss-saaj jar has loaded. As it turned out, this was just the begining of my problems on this. Although I could be wrong on this, I think jboss wants you to use stateless session beans with web services annotations to essentially do annotated web services. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3964374#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...