IV01046: CUSTOM ClASSLOADER LEAK DUE TO CONTEXTCLASSLOADER OF JAVA2D DISPOSER THREAD

APAR status

• Closed as program error.

Error description

• Error Message: Memory Leak observed due to contextClassLoader
  field of Java2D disposer thread.
  .
  Stack Trace:
  0x2a38e7c0 com/ibm/ws/classloader/CompoundClassLoader
   0x2df04f68 java/lang/Thread@fd20fd2
    ?truncating at running thread LEAK
     Parents:
      0x2bd63220 ?Ljava/lang/Thread;@54065406
     Children:
      0x2c1e3448 java/lang/String@49ee49ee
      0x29d7ef48 java/lang/ThreadGroup@55625562
      0x2df2a6d8 sun/java2d/Disposer@fce0fce
      0x2a38e7c0
  com/ibm/ws/classloader/CompoundClassLoader@3eac3eac
      0x2df16f58 java/security/AccessControlContext@10281028
      0x2df16f70 java/lang/Thread$ThreadLock@fea0fea
      0x2df16f80 java/lang/ThreadLocal$ThreadLocalMap@fee0fee
  -------
  
  Look at the String object in Children to find out the thread
  name to see
  whether it's Java2D disposer thread.
  
  J9VMJavaLangString at 0x2c1e3448 {
      struct J9Class* clazz = !j9class 0x2664b960   //
  java/lang/String
      U_32 flags = 0x49ee800e;
      UDATA monitor = 0x0;
      [C value = !j9object 0x2C1E3468 (offset=0)
      I offset = 0 (offset=4)
      I count = 15 (offset=8)
      I hashCode = -20996897 (offset=12)
      "Java2D Disposer"
  }
  

Local fix

• N/A
  

Problem summary

• The Java2D Disposer thread is holding a reference to a custom
  ClassLoader through its contextClassLoader field. As this is a
  demon thread which runs for JVM lifetime, the custom class
  loaders are not garbage collected even after the application
  restart
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR13
  .
  The JVM has been modified to remove the reference to
  ContextClassLoader and thereby allowing the custom class loader
  to be garabage collected
  .
  To obtain the fix:
  Install build 20110610 or later
  

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:

  PM44802

Fix information

• Fixed component name

  JAVA 5 CLASS LI

• Fixed component ID

  620500130

Applicable component levels

• R500 PSY

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