Hi All, Well, thanks to help from Richard's posts, I was able to get jboss-4.0.4 AS working with jbossws-2.0.1. I was still getting an error: anonymous wrote : | java.lang.NoSuchMethodError: javax.xml.bind.JAXBContext.newInstance([Ljava/lang/Class;)Ljavax/xml/bind/JAXBContext; However, I tracked this down to the fact that jboss-4.0.4 AS ships with JAXB 1.x (not sure exact version, but I checked method signatures and know it is prior to JAXB 2), and jboss-ws 2.0.1 requires JAXB 2. A JIRA entry by Thomas also confirms this: http://jira.jboss.com/jira/browse/JBWS-947 If I do as Thomas suggested and drop in the jaxb-api.jar into the endorsed directory, it works. I did verify this, as a test. However, this is not a viable solution for us, nor is modifying the contents of the jboss-j2ee.jar and jbossall-client.jar. So basically I've reached a dead-end in terms of jboss-4.0.4 and jbossws-2.0.1 integration. Hopefully this information will be useful for someone who is trying to run jboss-4.0.4 AS with jbossws-2.0.1 and is able to make one of the two fixes described in http://jira.jboss.com/jira/browse/JBWS-947 As for me ... I'll have to look toward going to jboss-4.2.x AS and hopefully there won't be a JAXB conflict there, or look into another Web Services implementation. Thanks, Philip Tenn View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4095749#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...