Thread Safety in Action Servlets

Hello Struts People,
Any specific pointers on how to make access to the HTTPSession, specifically properties in the session, thread-safe? Should synchronization be used whenever accessing session properties? Is it enough to limit access to session variables just from within the Action Servlet's perform method?
-j

HTTP Session variables are your own. They just belong to you no one else.
The question of thread safety doesnt arise

Thanks Srikanth for your reply. I've heard good things about your Struts book. I guess I'm refering to the Struts API docs for the Action class:
Action
Where it states, "Access to other resources (JavaBeans, session variables, etc.) MUST be synchronized if those resources require protection. (Generally, however, resource classes should be designed to provide their own protection where necessary."
Does this just refer to resources used by more than one session, Singletons, etc?

Hi Jason,
I had never looked at it before. But it definitely sounds vague.
I am not exactly sure what they were trying to convey.
I would take a guess: They are probably referring to shared resources, and, as you said, singleton loosely belongs to shared resource category.