Potential PermGen Leak in Coherence*Web with Versioned Production Redeploy
(Doc ID 2445134.1)
Last updated on MARCH 12, 2021
Applies to:Oracle Coherence - Version 220.127.116.11.0 and later
Oracle WebLogic Server - Version 18.104.22.168.0 to 22.214.171.124.0 [Release 12c]
Information in this document applies to any platform.
When redeploying the versioned application in the Coherence*web WebLogic server domain, the old versions will always get retired after a stipulated interval of time and the latest version of the application shows as Active in the WLS Admin Console. Even though the previous versions of the application is retired eventually and not listed in the WebLogic Admin Console, you will notice memory leak after doing repeated redeploys even after the GC cycles. Heapdump analysis shows evidences of the memory leak in Permanent Generation (PermGen) heap space showing a dominator chain (the largest objects in the heap dump) going through weblogic.servlet.internal.session.management.WebLogicHttpSessionManager up to com.tangosol.net.SimpleServiceMonitor.
In specific, the below objects keep increasing in the heap as you redeploy new version of the application with retiring the old versions.
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