IV56469: SUBSEQUENT VM VERSIONS DO NOT HANDLE OBSOLETED JAVA 6 or Java 5 NON-PERSISTENT SHARED CACHE CONTROL FILES CORRECTLY WHEN

APAR status

• Closed as program error.

Error description

• Error Message: Command "java -Xshareclasses:destroyAll" may hang
  with JVMs later than Java 6 if there exists some
  obsoleted Java 6 or Java 5 control files for non-persistent
  shared caches .
  Stack Trace: N/A
  .
  

Local fix

• The obsolete shared cache control files can be deleted using
  the Java 6 or Java 5 JVM with the same command:
  
     JAVA_6_OR_5/bin/java -Xshareclasses:destroyAll
  

Problem summary

• The problem is caused when there are Java 6 non-persistent
  shared cache semaphore control files, obsoleted by a machine
  restart, opened by a JVM later than Java 6 for the purpose of
  deleting the caches, and there is an existing IPC semaphore
  resource in OS memory which uses the same id expected by the
  obsolete control file.
  

Problem conclusion

• This APAR will be fixed in the following Java Releases:
     6 R1 SR8       (6.1.8.0)
     7 R1 SR1       (7.1.1.0)
     7    SR7       (7.0.7.0)
  .
  The JVM has been updated so that the obsolete control files are
  detected, and removed if possible.
  

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

  J9 COMMON CODE

• Fixed component ID

  620700127

Applicable component levels

• R260 PSY

     UP

• R270 PSY

     UP