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Viewing user connectivity & orphaned sessions

 
ron fleming
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(two separate topics/questions)

Is there anyway with Tomcat 4.1.18 to view how many users are connected to my web application at any given time?

Also, is there a general rule of thumb for how much memory an orphaned session uses? I have my inactivity timeout set to 30 minutes and I am wondering if my users are just closing the IE window without properly logging out, leaving an orphaned session in memory for 30 minutes.
 
William Brogden
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I would not worry about "orphan" sessions - Tomcat is allowed to serialize sessions to disk to manage memory. The minimum size session is tiny, memory use depends entirely on the references you store there - no generalization is possible.

The "manager" application for Tomcat will show you the number of active sessions - it is impossible to tell exactly the number of users "connected" but the number of active sessions will be the max. As I recall, the manager app was not part of the standard Tomcat 4 download for security reasons.

I upgraded from Tomcat 4 to 5 a number of years ago with no trouble.

Bill
 
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