José, > Looking Windows Task > Manager I perceived the natural memory increase. > > I noticed that when I > call my logout method (It calls session.invalidate()) or my user session > expieres the memory is still in use, in other words, the memory is not > cleaned.
Windows only reports the size of the application in memory. Once Java requests memory from the OS, I don't believe that it ever returns it. So, the memory size reported by Windows Task Manager will only increase, never decrease. You need to look at the memory behavior /inside/ the JVM, which is much more complicated than what Windows Task Manager displays. There are some tools that will help you see into a JVM, including simply using the "verbose GC" settings when starting your JVM, as well as some other 3rd-party tools that can give you a lot of information about the JVM upon which Tomcat is running (LabmdaProbe comes to mind: http://www.lambdaprobe.org/d/index.htm). Hope that helps, -chris
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