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From "Radim Kolar (JIRA)" <>
Subject [jira] Created: (GERONIMO-3838) memory (probably related to sessions) leak
Date Mon, 11 Feb 2008 19:54:08 GMT
memory (probably related to sessions) leak

                 Key: GERONIMO-3838
             Project: Geronimo
          Issue Type: Bug
      Security Level: public (Regular issues)
          Components: Memory Leaks
    Affects Versions: 2.0.2
         Environment: tested with JDK 1.5 running on Windows XP and FreeBSD6.2
            Reporter: Radim Kolar
            Priority: Critical

There is memory leak and it can be repeated very easily, so it should be very easy to catch

Install Geronimo and then run some kind of benchmarking software against its admin UI login
page, for example
program ab from Apache HTTP. This is realistic attack scenario, because lot of denial of service
attacks are doing this (requesting one page many times).

Watching memory used graph in admin console shows free memory slowly decreasing. After all
available memory is exhausted, application server stops serving new requests and never restores
ifself back to working state.

I think that it is caused by allocating sessions without limiting total number of sessions
to keep in memory and possibly to swap sessions out to file. There needs to be user-configurable
setting for preventing this, it would be nice to add such setting to Admin console.

Its very important to get this bug fixed.

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