IJ05380: JAVA.UTIL.LOGGING.LEVEL$KNOWNLEVEL HOLDING THE STRONG REFERENCES TO HASHMAP ENTERIES LEADING TO OUTOFMEMORYERROR.

APAR status

• Closed as program error.

Error description

• Error Message: Dump Event "systhrow" (00040000) Detail
  "java/lang/OutOfMemoryError" "Java heap space" received
  .
  Stack Trace: N/A
  .
  Here is the path to GC root diagram produced by Memory Analyzer,
  for one of the leak suspect ClassLoader object:
  ----------------------------------------------------------------
  ------org.apache.tools.ant.loader.AntClassLoader5
  
  '- <classloader>, <classLoader> class
  com.ibm.websphere.logging.WsLevel
  '- <class> com.ibm.websphere.logging.WsLevel
  '- levelObject java.util.logging.Level$KnownLevel
  '- <OSB>175<CSB> java.lang.Object<OSB>244<CSB>
  '- elementData java.util.ArrayList
  '- value java.util.HashMap$Entry
  '- <OSB>24<CSB> java.util.HashMap$Entry<OSB>32<CSB>
  '- table java.util.HashMap
  '- nameToLevels class java.util.logging.Level$KnownLevel
  ----------------------------------------------------------------
  ------
  

Local fix

• N/A
  

Problem summary

• The classloaders are kept alive on the heap as they had strong
  references maintained by java.util.logging.Level$KnownLevel.
  

Problem conclusion

• The java.util.logging.Level code has been modified to make use
  of weakreferences to avoid the OutOfMemoryError.
  .
  This APAR will be fixed in the following Java Releases:
     7    SR10 FP30 (7.0.10.30)
     7 R1 SR4 FP30  (7.1.4.30)
     8    SR5 FP20  (8.0.5.20)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
             https://www.ibm.com/developerworks/java/jdk/
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R700 PSY

     UP

• R800 PSY

     UP