Applet on client to help with session invalidation

Dear All,
I have a web application that when run by a user, per request, takes up approximately 40 MB of memory due to massive data structures being created, etc. Obviously, if the user leaves the site and goes elsewhere, I don't want that memory being held, even until the session times out(which I have to set at 30 minutes, due to the user community requests). It was suggested to me to create an applet that is embedded in every JSP page that constantly updates an property in a servlet basically saying "I'm here" and when that property hasn't been updated in N seconds, the servlet will call the invalidate method on the session that's not been updated.
Is this approach feasible? Is there some simpler method I could take to get the same effect? I realize the web is state-less, but I need a work-around in this case to make it act like it is.
Thanks,
Mike Brubaker

You should not need a full-blown applet. You could always use the HTTP meta-refresh tags to request that the browser poll over an interval you specify. The simplest approach would be to open a popup window that has the refresh logic. Place a button there, "logout". You could also have a message, such as, "User [username] has been logged on for [interval]."
Also, consider serializing the 40 mB memory structure to the filesystem. This would work best if the time between requests is relatively longer than in most applications. If the latency of the database routines to generate the 40 mB structure is low, and the interval between requests is relatively high, consider discarding the memory structure after the request has been completed.
- Saish
"My karma ran over your dogma." - Anon

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have created a login page (php/mysql) with username and
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Murray --- ICQ 71997575
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message
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password boxes.
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> Adobe's site.
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use this code, please arrange your User interface correctly.
* TimesTableApplet.java
* Created on March 12, 2007, 12:08 PM
* @author cc.woon
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for(int i =1;i<=10;i++){
output += whichTable +" times "+i + ": "+(i*whichTable)+"\n";
resultString = Integer.toString ( result ) ;
//resultBox.setText ( whichTableString + " times " + timesString + " is " + resultString ) ;
resultBox.setText ( output) ;
} // End of try block
catch ( NumberFormatException entry )
// Display error message and clear whichTableBox
showStatus ( "Error: Invalid Input - not an integer!" ) ;
whichTableBox.setText ( "" ) ;
} // End of catch block
} // End of else statement
} // End of actionPerformed method
} // End of class

Applet on client to help with session invalidation

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