Dear JBoss developers, I spent several days to solve the problem of polymorphism in JBoss WebService, but failed. I googled many articles, Only "http://forums.sun.com/thread.jspa?threadID=5225941" is usefull to me. But it just does NOT work!! Please help me. Great Thanks to any tips. My envirionment: jboss-5.1.0.GA-jdk6. jdk1.6.0_14_Windows Eclipse 3.2 My code: Server: -------------------------------------------------------------------------------------------------------------------- package com.ybxiang.ejbws; import javax.xml.bind.annotation.XmlSeeAlso; @XmlSeeAlso({Human.class}) public class Animal implements java.io.Serializable{ private String name; private Long age; public String getName() { return name; } public void setName(String name) { this.name = name; } public Long getAge() { return age; } public void setAge(Long age) { this.age = age; } public String toString(){ return "Animal-->name:"+this.getName()+",age:"+this.getAge(); } } ------------------------ package com.ybxiang.ejbws; public class Human extends Animal implements java.io.Serializable{ private String email; public void setEmail(String email) { this.email = email; } public String getEmail() { return email; } public String toString(){ return "Human-->name:"+this.getName()+",age:"+this.getAge()+","+"email:"+email; } } ------------------------ package com.ybxiang.ejbws; import java.util.ArrayList; import java.util.Iterator; import javax.jws.WebMethod; public interface EJBWebServiceInterface { public void passParameter1(String s); public void passParameter2(Animal a); public void passParameter3(Human h); public void passParameter4(ArrayList lst); public ArrayList<? extends Animal> returnSomething1(int type); } ------------------------ package com.ybxiang.ejbws; import java.util.ArrayList; import java.util.Iterator; import javax.ejb.Stateless; import javax.jws.WebMethod; import javax.jws.WebService; import javax.xml.bind.annotation.XmlSeeAlso; import javax.jws.soap.SOAPBinding; @Stateless @WebService //(a)**XmlSeeAlso({Animal.class, Human.class}) public class EJBWebServiceBean implements EJBWebServiceInterface{ @WebMethod public void passParameter1(String s){ System.out.println("------------String is got:"+s); } @WebMethod public void passParameter2(Animal a){ System.out.println("------------Animal is got:"+a); if(a instanceof Human){ System.out.println("************* It's realy human!!! *************"); } } @WebMethod public void passParameter3(Human h){ System.out.println("------------Human is got, name:"+h.getName()+", email:"+h.getEmail()); } @WebMethod public void passParameter4(ArrayList lst){ System.out.println("------------ArrayList is got:"); if(lst!=null){ Iterator it = lst.iterator(); Animal a = it.next(); if(a instanceof Human){ System.out.println("One human is got:"+((Human)a)); }else{ System.out.println("One Animal is got:"+a); } }else{ System.out.println("------------List is null."); } } @WebMethod public ArrayList<? extends Animal> returnSomething1(int type){ if(type==1){ ArrayList aa = new ArrayList(); { Animal animal1 = new Animal(); animal1.setName("Animal.1"); animal1.setAge(new Long(1)); aa.add(animal1); } { Animal animal2 = new Animal(); animal2.setName("Animal.2"); animal2.setAge(new Long(2)); aa.add(animal2); } return aa; }else{ ArrayList bb = new ArrayList(); { Human human1 = new Human(); human1.setName("Human.1"); human1.setAge(new Long(1)); bb.add(human1); } { Human human2 = new Human(); human2.setName("Human.2"); human2.setAge(new Long(2)); bb.add(human2); } return bb; } } } View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4263889#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...