It's the JAXWS API that uses a service loader mechanism to pull the implementation. You have to make sure that WS invocation don't have the Sun API (jaxws-rt.jar, jaxws-tools.jar, jaxws-api.jar) on the classpath. JBossWS ships with it's own impl. of the API wich then delegates to the correct provider implementation: jboss-jaxws.jar It's a little tricky to get both tooling and web service invocations into the project, because tooling still requires those jars mentioned above. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4155882#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...