Session.invalidate()

Question

Hi Techies,
I am new to servlet, can any one please explore what happens internally when we call session.invalidate().
whether it removes the session completely?
thanks in advance.

Answer 1

Nitin.V wrote:
if (session != null) {
               session.invalidate();
               RequestDispatcher rd = req.getRequestDispatcher(LOGOUT_URL);
                rd.forward(req, res);
System.out.println(session);in the last line i am still getting the value of this session.
what i am expecting is, it should print null value after being invalidating but i am getting session value.
could you please explore this.
No, you shouldn't get null. The session you are referencing still exists, it is just invalid. Any further call to getSession(false) will return null, but the current reference still exists. If you want to get null in the current page/servlet then set your variable "session" to null (which does nothing to the actual session object, it simply removes your reference to it) after you call invalidate. I stressed after, because if you simply set your variable to null, the session itself, will still be valid.