In the Install.txt for jbossws-1.0.3, you'll find this: anonymous wrote : In order to upgrade to 1.0.3 you need to manually replace the jboss-xml-binding.jar | in the JBOSS/client and JBOSS/lib directories. | The 4.0.4GA compatible release can be found here: | http://repository.jboss.com/jboss/jbossxb/1.0.0.CR6/ The class you mention is in this jar. I don't know how it will play with the older 4.0.2 release though. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3975009#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...