Memory Fully utilized by Java ConcurrentHashMap (under Tomcat)

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This problem has bug me for a bad 7 days! And finally i found out the real problem! Below are the tasks on what i have tried but failed to solve the OutOfMemory Exception:

-change from using concurrenthashmap to ehcache. (turns out ehcache is also using ConcurrentHashMap)

-change all the hard reference to Soft Reference

-Override the AbstractMap along side with concurrnetHashMap as per suggest by Dr. Heinz M. Kabutz

The million dollar question is really “why 30-45 minutes later, memory starting to release back to the heap pool?”

The actual root cause was because there is something else still holding the actual variable session, and the culprit is the http session within tomcat is still active! Hence, even though the http session was completed, but if the timeout setting is 30 minutes, tomcat will hold the session information for 30 minutes before JVM can GC those. Problem solve immediately after changing the timeout setting to 1 minute as testing.

$tomcat_folder\conf\web.xml

<session-config>
    <session-timeout>1</session-timeout>
</session-config>

Hope this will help anyone out there with similar problem.

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