IJ23665: JAVA JIT: FAILURE TO COMPILE LARGE METHODS CONTAINING CALLS TO JNI ROUTINES

APAR status

• Closed as program error.

Error description

• Error Message: Slow execution due to a failure to JIT compile a
  method when using zOS 31bit Java 8.0.5.37 (or any release up to
  the release containing this fix).
  .
  Stack Trace: N/A
  .
  The issue can only happen on zOS 31bit JVMs starting with
  8.0.5.37. The issue is not possible on zLinux, 64bit JVMs or any
  other platform. A compiler failure can only happen when the
  method being compiled contains (or inlines a method that
  contains) a call to a JNI method. The result will always be an
  aborted compile where the JIT reverts to a lower optimization
  level or forces the method to be executed by the byte-code
  interpreter. This issue can not result in a crash or any
  unexpected behavior.
  

Local fix

Problem summary

• With 8.0.5.37 a change was made to improve the functionality of
  the JIT with regards to how it can handle XPLINK conventions (to
  enable future development work). This change caused a new
  limitation to appear that could cause the compiler to abort the
  compilation of some extremely large methods that include calls
  to JNI routines.
  

Problem conclusion

• The JIT was fixed so that it can handle compiling extremely
  large methods without aborting the compilation.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR6 FP10  (8.0.6.10)
  .
  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

  JIT

• Fixed component ID

  620700124

Applicable component levels