I also have the same problem. I have used jboss4.2.0+jbossws2.0.1+jdk 1.5. I tried using @XmlSeeAlso on base class but it also can't solved my porblem. I have the following situation: My Pojo classes @XmlSeeAlso({B.class,C.class}) public class A extends java.io.Serializable{ } public class B extends A{ } public class C extends A{ } Now webservice @WebService(name = "MyWebServicePortType", serviceName = "MyWebService", portName = "MyWebServicePort",targetNamespace = "http://mywebservice.com") @SOAPBinding(style = SOAPBinding.Style.DOCUMENT, use = SOAPBinding.Use.LITERAL, parameterStyle = SOAPBinding.ParameterStyle.WRAPPED) public class MyWebService{ @WebMethod public String getClassName(A obj){ String className=obj.getClass().getName(); return className; //it always returns ?A? on jbossWS2.0.1 even if I pass the reference of B while calling this function from client } } Does anybody knows the solution? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4087022#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...