Session in Interceptors

[Eric Lentz]

In an interceptor I have a need to store a value in the session. I can see 
a session map that I find in the invocation's object graph that is 
available in the interceptor, but storing back to the map has no effect. 
Is there a "Struts 2 way" to get/set the session within an interceptor or 
do I just do something like this?
                HttpServletRequest request = (HttpServletRequest) 
context.get(StrutsStatics.HTTP_REQUEST);
                HttpSession session = request.getSession(true);
                //set session as needed