web-services - Web service servlet context is null

Question

I am developing a stand alone web service, which doesn't need to be running inside a web container.

It looks very similar to this:

http://weblogs.java.net/blog/ramapulavarthi/archive/2006/06/maintaining_ses.html

I also found the following:

How can I access the ServletContext from within a JAX-WS web service?

I enabled the session management from the client with this:

((BindingProvider) webInterface).getRequestContext().put(BindingProvider.SESSION_MAINTAIN_PROPERTY, true);

on the server side, I was able to get the message context:

MessageContext mc = wsContext.getMessageContext();

But when I trying to get:

Object c = mc.get(MessageContext.SERVLET_REQUEST);

The object c is always null.