Clock [Q] How to enable session tracking in my android app?

I'm now developing my first Android application.
My application interacts with a web service using SOAP messages.
The web service sits in glassfish4 server.
So I want that every user that interacts with the web service will get a new instance of the class that represents the web service. I read that to do this, I need to add the @httpsessionScope annotation to the web service class. But what should I write on the client side, in the android application to enable the session tracking?