I'm also having the same problem. I'm using jboss4.2.0+jbossWS2.0.1+jdk1.5 everything is fine,WSDL is ok & client is also calling the service but instead of returning the subclass reference it always returns base class object. I also have tried using @XmlSeeAlso but same problem. Any Suggestion to solve my problem. View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4087725#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...