How can we manage session using JAX-WS?

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Hi,

We are currently using the Jboss 4.0.5 GA, JAX-WS webservices. I am trying to implement session management. I am getting WebServiceContext injection is null. Please find the code below which I have implemented Server and client side for session management. Can anyone help me why I am getting WebServiceContext null. If you have any code works on Jboss4.0.5 it is really helpful for me

Server Side code
--------------------
/*
* Hello.java
*
* Created on September 24, 2007, 10:42 AM
*
* To change this template, choose Tools | Template Manager
* and open the template in the editor.
*/

package cisco;

import javax.jws.*;
import javax.xml.ws.WebServiceContext;
import javax.annotation.Resource;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.xml.ws.WebServiceException;
import javax.xml.ws.handler.MessageContext;
import javax.servlet.http.HttpSession;

@WebService
public class Hello {
/**
* WebServiceContext is injected by the JAX-WS Runtime
*/
@Resource
private WebServiceContext wsContext;

/**
* another way to inject WebServiceContext
* make sure this is not a WebMethod
*
*/
/*
@WebMethod(exclude = true)
@Resource public void initializeContext(WebServiceContext wsContext) {
System.out.println("Setting WebServiceContext");
this.wsContext = wsContext;
}
*/
@WebMethod
public int getCounter() {
MessageContext mc = wsContext.getMessageContext();
HttpSession session = ((javax.servlet.http.HttpServletRequest) mc.get(MessageContext.SERVLET_REQUEST)).getSession();
// Get a session property "counter" from context
if (session == null)
throw new WebServiceException("No session in WebServiceContext");
Integer counter = (Integer) session.getAttribute("counter");
if (counter == null) {
counter = new Integer(0);
System.out.println("Starting the Session");
}
counter = new Integer(counter.intValue() + 1);
session.setAttribute("counter", counter);

return counter;

}

/**
* Lifecycle method called before servicing any requests
*/
@PostConstruct
@WebMethod(exclude = true)
public void onBeginService() {
System.out.println("Called onBeginService: Session test");
// Initialize resources need by the Service
// ....
}

/**
* Lifecycle method called before destroying the service instance
*/
@PreDestroy
@WebMethod(exclude = true)
public void onEndService() {
System.out.println("Called onEndService: Session test");
// Clean up resources need by the Service
// ....
}
}

Client Clode:
try {
cisco.HelloService service = new cisco.HelloService();
cisco.Hello port = service.getHelloPort();
((BindingProvider)port).getRequestContext().put(BindingProvider.SESSION_MAINTAIN_PROPERTY,new Boolean(true));
// TODO process result here
//int result = port.getCounter();
//out.println("Result = "+result);

//Hello proxy = new HelloService().getHelloPort();
//((BindingProvider)proxy).getRequestContext().put(BindingProvider.SESSION_MAINTAIN_PROPERTY,true);
int result = port.getCounter();
System.out.println(result);
result = port.getCounter();
System.out.println(result);

} catch (Exception ex) {
ex.printStackTrace();
}