IV19710: RE-TRANSFORMED CLASSES ARE INCORRECTLY STORED IN SHARED CLASS CA CHE IF THE CLASS IS NOT MODIFIED BY JAVA/JVMTI AGENT

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  

Local fix

• Either disable shared cache using -Xshareclasses:none, or do not
  use re-transformation capable java/jvmti agents
  

Problem summary

• Default behavior of JVM is not to store re-transformed classes
  into shared cache. However if a java/jvmti agent,while
  re-transforming classes, does not modify a class, then JVM
  deviates from the default behavior and incorrectly stores the
  class in cache. Although it will not have impact on application
  behavior, but it can result in unexpected increase in shared
  cache usage.
  Note that if the JVM is running with
  -Xshareclasses:cacheRetransformed then all re-transformed
  classes are stored in cache. In this case, JVM behaves as
  expected.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR1
  6.0.1 SR2
  .
  The JVM has been updated to prevent unmodified re-transformed
  classes from being stored into the cache when not running with
  -Xshareclasses:cacheRetransformed.
  

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

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