JSP Session problem in HTML frames????

Hi everybody;
I have a problem with session I think. My index page is created with 4 diffrent jsp's in 4 diffrent frames.After a while lets say 15 minutes when my session is expired.When I click one of my button ..The frames which linked with that button is show Http 500 error page.When I refreshes the web page they all gone.(and my web page goes normal again)
I want to ask you how can I handle this problem.How can I solve this error page showing and stop showing that error page instead of in each frame,to refresh the index page again??
Thanks for your consideration.....

The first step is to decide whether 15 minutes is a suitable timeout for sessions.
If it isn't then simply increase it in web.xml. You may also decide that session persistence is worth enabling (if your Servlet container supports it).
If it's not then your pages will need to handle a null (or at least new) session slightly more elegantly. You're probably just getting a null pointer exception because something your pages is relying on is missing (a session attribute of some sort). Sometimes it's sufficient just to redirect the topmost window to the index page - not the greatest user experience in the world but at least consistent.
Hope this helps.

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