How to grab the total # of user-sessions?

Hi everyone,
Looking through the javax HttpServlet interface, I didn't see any way to capture the total number of current user sessions on the server.
Is there a way to do with without setting any sort of variable counter? Ie, session.setAttribute("counter", x+1);
Thanks!

You could use an HttpSessionListener to know when they are created and destroyed and keep the cound in the application scope.

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