How to keep track of the users who are all currently logged in

Hi All,
I have basic knowledge of Session and Servlets. I am wondering how to keep track of the users who are all currently logged in. There should be some way of achieving it.
I thought of it and come up with having an Application variable that hold it when ever a user successfully logged in.
Thanks in advance for any reply.

You can do this by keeping data in a static veriable in a some class of yours. The variable will need to be a collection.
Whenever a user loogs in to the site a servlet/jsp should put the users information in to the collection and when logs off or when the session expires the entry should be take off.
You can achive this by storing the velues in a some sort of a week collection where the entries are automaticaly removed when all the other refferences to the entry goes out of scope.
You might need to read bit about java.lang.ref package and WeekReference
Or you can make the entry in the collection contain the last time that the user visited any of the pages and a thread can run time to time and clean up the older entries which have timed out

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