Existing session is becoming null when returning from jsp

Question

Hi Guys !
I have an urgent requirement to meet in few days from now and got stuck with session problem in servlet.
Scenario :-
For the first time when i call a servlet a new sessoin is created and after some validations i forward to a jsp which has some links.
I have printed sessoin ids from both the servlet and jsp and they are same.
Now when i clicked on the link in jsp , the servlet is called but session is lost its becoming null.
Servlet Code :
HttpSession session = request.getSession(false);
if(session ==null){
// create session code ....using getSession(true)
RequestDispatcher r = servletcontext.getRequestDispatcher(resp.encodeURL("/user.jsp"));
jsp code:-
<a href="<%=response.encodeURL(/application/servlet/ViewUser") %">" > View User </a>
GUYS GIVE ME A SUGGESTION IN THIS REGARD AS SOON AS POSSIBLE .....
Thanks in advance !
Aparna</a>

Answer 1

Hi,
Session Create Code in Login file
HttpSession hs = req.getSession( true );
hs.setAttribute( "user", lb.getUsername() ); // username() is ur unique id
Session Tracking code in all file
               HttpSession hs=request.getSession();
               if ( hs == null || hs.getAttribute( "user" ) == null )
                    response.sendRedirect ( "./index.jsp" );
Logout code
HttpSession hs=req.getSession(false);
               hs.setAttribute( "user", null );
               hs.invalidate();
               res.sendRedirect ( "./index.jsp" );
// I hope this snippet will help u..