Session already invalidated error

Question

hi everybody
i am devloping one application in which i have written following jsp file
usermater.jsp
<%@page language="java" session="true"%>
<%@include file="common.jsp" %>
<%
String uerrorMessage=(String)session.getAttribute("upasserrorMessage"); %>
common.jsp has following code
<%
if (! session.getId().equals((String)session.getAttribute("TF.Server.Session.ID")) )
session.invalidate();
response.sendRedirect("timeout.jsp");
%>
what i want to do is Whenever user tries to access the usermaster.jsp page directly his session must be invalidated and he is redirected to the "timeout.jsp" page but when i am trying to access the usermaster.jsp page direclty i am getting the following error
java.lang.IllegalStateException: getAttribute: Session already invalidated
this is because in usermaster.jsp file i am trying to access the session variable
String uerrorMessage=(String)session.getAttribute("upasserrorMessage"); %>
How to invalide the user's session and how to avoid this error?
Thanks in advance
Regards
bunty

Answer 1

Okay at the top of th epage you invalidate the session and then do a redirect. But a redirect just sets a response header and doesn't prevent the rest of the JSP from running. Try putting a return directly after the redirect.
<%
if (! session.getId().equals((String)session.getAttribute("TF.Server.Session.ID")) )
session.invalidate();
response.sendRedirect("timeout.jsp");
return;
%>