I encountered a problem with WebLogic throwing atypical out of memory errors. I would set the heap size to 1660m and then the error would go away for a while or trickle down to the next product. Eventually, increasing the heap size did not seem the right solution. This happened after setting the MSAD external authentication in Shared Services.
Here is the error that we found:
java.lang.OutOfMemoryError
Exception in thread "[ACTIVE] ExecuteThread: '1' for queue: 'weblogic.kernel.Default (self-tuning)'" java.lang.OutOfMemoryError
Exception in thread "weblogic.timers.TimerThread" java.lang.OutOfMemoryError: getNewTla
Resolution:
I had suspicions about the MSAD configuration because the logs indicated the failure occurs when trying to initialize or read the MSAD provider that had been set up. It turns out the company was very large, and the Maximum Size in the External Authentication configuration was set to 0 (unlimited). Consequently, OOM errors were being thrown. The value was set to 200 which resolved the issue.
http://docs.oracle.com/cd/E17236_01/epm.1112/hss_admin.pdf
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