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Support Article

"Unloading class" and "CodeCache is full" messages in logs

SA-21882

Summary



Several occurrences of "Unloading class" messages on server.  


Error Messages



[Unloading class sun.reflect.GeneratedConstructorAccessor3153]
[Unloading class sun.reflect.GeneratedConstructorAccessor2967]
[Unloading class sun.reflect.GeneratedMethodAccessor614]
[Unloading class sun.reflect.GeneratedConstructorAccessor3155]

and

Java HotSpot(TM) 64-Bit Server VM warning: CodeCache is full. Compiler has been disabled.
Java HotSpot(TM) 64-Bit Server VM warning: Try increasing the code cache size using -XX:ReservedCodeCacheSize=


Steps to Reproduce



Start server.

Root Cause



A defect or configuration issue in the operating environment, specifically JVM argument tuning.

Resolution



Make the following change to the operating environment: 

Add the following JVM arguments (for a total heap of 8G):

 
-XX:+CMSClassUnloadingEnabled
-XX:ReservedCodeCacheSize=512m (increase as needed)
-XX:+UseCodeCacheFlushing
-XX:NewSize=2048m 
-XX:MaxNewSize=2048m 
-XX:+UseCMSInitiatingOccupancyOnly
-XX:CMSInitiatingOccupancyFraction=75 
-XX:+DisableExplicitGC

Remove:

-XX:+PrintTenuringDistribution

Published April 11, 2016 - Updated October 8, 2020

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