I have a webapp requiring a user to log in before doing anything else. State information is stored in an object in a session attribute called "state". When I log out I do the following:

    HttpSession session = request.getSession();
    if (session != null) {
      session.removeAttribute("state");
      try {
        session.invalidate();
      }
      catch (IllegalStateException e) { }
    }

I go to the webapp and log in, then open another tab for the same webapp and log out, executing the code above. I then go back to the first tab and click a button which sends a POST request to a servlet that starts off like this:

    HttpSession session = request.getSession();
SessionState state = (session != null ? (SessionState)session.getAttribute("state") : null);

The session and the state are both valid objects after these two lines.

Can anyone tell me what might be happening here?

--
John English
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