I have tried @XmlSeeAlso on jbossWS2.0.1 to solved the type substitution problem[inheritance problem]. But it does not solved my problem. 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=4087014#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...