IZ74784: JAVA JIT - UNEXPECTED NUMBERFORMATEXCEPTION

APAR status

• Closed as program error.

Error description

• Error Message: An unexpected java.lang.NumberFormatException is
  thrown when the JIT compiler is enabled.
  .
  Stack Trace: N/A
  .
  When a long multiply (or long divide in some cases) has both
  input values as constants (or can be statically simplified to be
  constants) the JIT might incorrectly compute the results when
  one or both of the the constants uses the upper 32bits of the
  long.
  

Local fix

• You can avoid this problem by using the following Java command
  line parameter:
  -Xjit:disableTreeSimplification
  Using this option will cause the java application to generate
  less optimal code and will effect the performance of the
  application slightly.
  

Problem summary

• When the JIT is able to statically calculate the result of a
  long multiply operation and one of the static values uses the
  upper 32bits of the long, the JIT will incorrectly compute the
  result and replace the multiply with an invalid constant result.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR8 FP1
  .
  The JIT was modified to fix this problem by computing the
  correct long multiply results.
  .
  To obtain the fix:
  Install build 20100415 or later
  

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

• R600 PSN

     UP