IV78338: CRASH OR POOR PERFORMANCE FROM CERTAIN INSTANCEOF OPERATIONS

APAR status

• Closed as program error.

Error description

• Error Message: Failure symptom will be either a performance
  reduction with increased time spent in the instanceof codepaths
  or a segmentation error in the JIT compiler code generator while
  evaluating an instanceof operation on an abstract final class in
  the JCL.
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• Under certain circumstances the JIT code generator can produce
  slow or incorrect code when processing classes which are both
  abstract and final. These classes cannot be generated from user
  code - this combination can only appear on certain special core
  classes in the Java Class Library.
  

Problem conclusion

• The JIT code generators have been modified to ensure the code
  generator correctly handles abstract final classes.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR2 (8.0.2.0)
  .
  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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP