How to know if a session finished in jsp

Hello,
How to know if a session finished in jsp?
Help me please.
Best Regards.
Joseph

Depends. You can create a javax.servlet.http.HttpSessionListener implementation and register it in the web.xml file (I forget the syntax, though), which can notify you of sessions being created and destroyed.
Or you can create a javax.servlet.http.HttpSessionBindingListener implementation and add it to the session (setAttribute()) and it'll have it's valueUnbound method called when the session expires (or the attribute is removed, but if you don't remove it, the session invalidating will). That's a good place for session-specific clean-up.

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