[TomCat] Routine Before Session End.

[Asso]

Hi all,
I'm using TomCat 6.x for the execution of JSP pages.
When an user log in to my web application, TomCat create a new Server Session that is closed a few seconds ago the user's inactivity.
I would enforce the Tomcat to execute, automatically, a routine contained in the .JAR library BEFORE the session ending.
There is any solution to do this?

Thank You very much.

Asso.