IJ12097: WRONG RESULT FROM STRING.INDEXOF AND STRING.LASTINDEXOF

APAR status

• Closed as program error.

Error description

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

Local fix

• -Xjit:disableUnsafeFastPath or
  -Xjit:{full/signature/of/the/problematic/method}(disableUnsafeFa
  stPath) can be used to work around this issue. The latter one
  has much smaller performance impact.
  

Problem summary

• The problem is caused by JIT compiled code incorrectly widening
  a byte value loaded from the backing array of a String.
  Comparison using the widened value may unexpectedly fail. The
  wrong widening occurs when String.indexOf and String.lastIndexOf
  are compiled or inlined.
  

Problem conclusion

• The JIT has been updated to correctly widen the byte value
  loaded from String's backing array.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR5 FP27 (8.0.5.27)
  .
  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