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Support Article

OutOfMemory

SA-374

Summary



Users are intermittantly unable to login to PRPC.  Existing users are able to work, but report slow performance.  Examination of the Pega logfile shows java.lang.OutOfMemoryError errors.  Note that the environment is a 32bit JVM/WebSphere implementation.

Error Messages



Multiple errror conditions were observed.  The following is one of several out-of-memory errors observed in the logfile:


2014-07-17 05:03:19,482 [j2ee14_ws,maxpri=10]] [  STANDARD] [                    ] (     internal.async.AgentQueue) WARN    - Out of memory exception caught in agent queue: OrgXXHFW #6: Org-FW-YYY-Work.RetrySLAProcess
java.lang.OutOfMemoryError: ZIP002:OutOfMemoryError, MEM_ERROR in deflate_init2
                at java.util.zip.Deflater.init(Native Method)
                at java.util.zip.Deflater.<init>(Deflater.java:150)
                at java.util.zip.Deflater.<init>(Deflater.java:159)

Steps to Reproduce



To reproduce, restart Process Commander, and monitor the PRPC log.  Intermittantly, this error (or a derivative) is observed.  No specific reproduction procedure was found to trigger this error condition.  Also note, the above error condition is one of several similar out of memory errors found in the logfile.

Root Cause



The root cause was found to be a known defect in the IBM J9 JVM.  This defect is discussed here:

Native OutOfMemory problems are a known problem with certain versions of the IBM J9 JVM for AIX and other Unix/Linux 
operating systems, and IBM has provided several important updates to correct this issue. SR11 (Service Release 11) of the IBM J9 JVM includes a critical fix for classloader static native memory allocations, and this key importance to your system.

Resolution



Per the description above, the solution to this SR is to obtain an updated IBM J9 JVM update kit for WebSphere, and apply the update.
Suggest Edit

Published March 11, 2016 - Updated October 8, 2020

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