How to find out number of concurrent users connectd to a site?

I would like to find out the number of concurrent users on my site. What is the best way to do it?
This is how I implement it currently:
I have a HashSet object in the session. whenever a user visits the page, i added the user's sessionID to the HashSet. But when a user leaves my page, it won't inform my jsp pages. The only thing I can do now is whenever I add a new sessionID, I loop through the HashSet and check to see which sessionID is invalid or inactive, then remove the it. Does a user session becomes invalid immediately when the user leaves the page, or it has to wait till it times out?
Are there any other more efficient ways of doing it?

Look at HttpSessionBindingListener. That will let you do what you want to, correctly.
User session will time not. If it were to become invalid immediately, it won't be called a "session" would it?

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How to find out number of concurrent users connectd to a site?

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