I am already using the XmlSeeAlso.. @XmlSeeAlso({Aa.class, Aaa.class}) public class A { } @XmlSeeAlso(Aaa.class) public class Aa extends A { } public class Aaa extends Aa {} And the WebService .. @WebService @SOAPBinding(style = SOAPBinding.Style.DOCUMENT, use = SOAPBinding.Use.LITERAL, parameterStyle = SOAPBinding.ParameterStyle.WRAPPED) @Stateless @RemoteBinding(jndiBinding=LookupConstants.CLIENT_MANAGER) @Depends({LookupConstants.CLIENT_SERVICE_OBJECT_NAME}) public class ClientManagerBean implements ClientManager { @WebMethod public A getA(int i) { A a = null; switch(i) { case 1: a = new Aa(); break; case 2: a = new Aa(); break; case 3: a = new Aaa(); break; } return a; } } This always returns just an object of type A on the Client side no matter what args I pass. I do not know what I'm missing... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4082301#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...