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From "Shapira, Yoav" <>
Subject RE: Garbage Collection issues
Date Mon, 01 Dec 2003 19:35:02 GMT

Perhaps you are experiencing higher load, which requires more memory.
Or perhaps your application does have a memory leak: those are possible
and occur in java, so yes that would a programming error on your part.
The garbage collector does much magic, but it can't save you all the
time.  You may wish to read up on java memory leaks, as they've been
discussed at length on this list and on the net in general.

Note that when you call Runtime#gc that's only a suggestion to the JVM:
many times when you call that the garbage collector may not run at all.

Yoav Shapira
Millennium ChemInformatics

>-----Original Message-----
>From: Neal []
>Sent: Sunday, November 30, 2003 8:21 PM
>To: 'Tomcat Users List'
>Subject: Garbage Collection issues
>My Tomcat 4.1 (hosted on Linux) seems to have a problem in recent
>with crashing due to unavailable free RAM.  Specifically I get a
>java.error.outOfMemory exception.  If check the RAM available
>(Runtime.getRuntime().totalMemory()), I can see it ticking down through
>the week.  If explicitly run garbage collection however my RAM totally
>frees up and all is well (Runtime.getRuntime().gc();).
>Why would this happen?  Surely this isn't due to a programming error on
>my part, otherwise, the resources should automatically released
>the JRE performs periodic garbage collection. Isn't that correct?
>Anyone have any theories as to what this may mean and what the best
>solution would be?
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