How to effectively detect the session expiration in the portlet (JSP pages)

In a web application using weblogic personalization server, I want to
monitor how many users are currently logged on the system.
It can be detected when a user logs on(by clicking sign on button), and logs
off (by clicking the sign off button).
I want to know how to detect the sign off event when the session
automatically expires (in this case, the user does not click the sign-off


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