Hello.

I have a problem with class inheritance in web services. I want to make a web service with one method to add objects of classes (B, C and other in the future) which inheritated from my basic class (A). My source code:

Server side:
1) TestService.java

@WebService(serviceName = "TestService")
@Stateless
@XmlSeeAlso({B.class, C.class})
public class TestService {
 @EJB
 TestMgmtLocal tl = null;

 @WebMethod(operationName = "testAddA")
 public @WebResult(name = "A")
 A testAddA(@WebParam(name = "testA") A testA) {
 return tl.testAddA(testA);
 }
}

2) TestMgmtLocal.java

@Local
public interface TestMgmtLocal extends TestMgmtRemote {

}

3) TestMgmtRemote.java

@Remote
public interface TestMgmtRemote {
 A testAddA(A testA);
}

4) TestMgmt.java

@Stateless
public class TestMgmt implements TestMgmtLocal {
 @Resource
 private SessionContext ctx = null;

 public A testAddA(A testA) {
 if (testA instanceof A) {
 System.out.println("class A");
 }

 if (testA instanceof B) {
 System.out.println("class B");
 }

 if (testA instanceof C) {
 System.out.println("class C");
 }

 return testA;
 }
}

5) A.java

public class A implements Serializable {

 private static final long serialVersionUID = 110181269433550832L;

 private int a = -1;

 public int getA() {
 return a;
 }

 public void setA(int a) {
 this.a = a;
 }
}

6) B.java

public class B extends A implements Serializable {

 private static final long serialVersionUID = 6921792702940813727L;

 private int b = -1;

 public int getB() {
 return b;
 }

 public void setB(int b) {
 this.b = b;
 }
}

7) C.java

public class C extends A implements Serializable {

 private static final long serialVersionUID = 7823155353151239133L;

 private int c = -1;

 public int getC() {
 return c;
 }

 public void setC(int c) {
 this.c = c;
 }
}

Client side:
1) TestClient.java

public class TestClient {

 public static void main(String[] args) {
 TestServiceProxy proxy = new TestServiceProxy();
 TestService_PortType port = proxy.getTestService_PortType();
 try {
 C c = new C();
 c.setA(2);
 c.setC(3);
 port.testAddA(c);
 } catch(RemoteException e) {
 System.out.println(e);
 }
 }
}

I found this page:
http://blog.vinodsingh.com/2008/09/anytype-object-over-webservice-and.html
but it doesn't work in my web service. In testAddA method I always get an object of A class (when I send from client object of B or C class). I've also tried to add @XmlSeeAlso annotation to A class but it doesn't help. Maybe I did something wrong? Any ideas? Any other solutions of this problem?

I'm using:
1) JBoss 4.2.3GA (I tired also on JBoss 5.1.GA)
2) Java 1.5 update 15