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Asked: 2026-05-10T16:37:01+00:00

Often, I found OutOfMemoryException on IBM Websphere Application Server. I think this exception occur

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Often, I found OutOfMemoryException on IBM Websphere Application Server. I think this exception occur because my application retrieve Huge data from database. So, I limit all query don’t retreive data more than 1000 records and set JVM of WAS follow

+ Verbose garbage collection + Maximum Heap size = 1024 (RAM on my server is 16 GB and now I already change to 8192) + Debug arguments = -Djava.compiler=NONE -Xdebug -Xnoagent                       -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=7777 + Generic JVM arguments = -Dsun.rmi.dgc.server.gcInterval=60000                            -Dsun.rmi.dgc.client.gcInterval=60000 -Xdisableexplicitgc                             -Dws.log=E:\WebApp\log -Dws.log.level=debug (ws.log and ws.log.level are my properties)

And I found heapdump, javacore and snap files in profiles folder I think them can tell me about cause of problem but I don’t know how to read/use heapdump, javacore and snap files.

Please tell me how to prevent/avoid/fix OutOfMemoryException. Thanks

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1 Answer

  1. The answer to this is dependent on the message associated with the OutOfMemoryException. You can also try -XX:MaxPermSize=… and set it to something larger like 256m.

    Also, if you have a recursive function somewhere, that may be causing a stack overflow.

    If you can, please post the message associated with the exception. Stacktrace might also help.

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