IZ86719: ARRAYINDEXOUTOFBOUNDSEXCEPTION WHEN RUNNING MEMORY ANALYZER

APAR status

• Closed as program error.

Error description

• Error Message: An unexpected ArrayIndexOutOfBoundsException is
  thrown when running the Eclipse Memory Analyzer.
  .
  Stack Trace: Exception in thread "main"
  java.lang.ArrayIndexOutOfBoundsException
   at org.eclipse.mat.collect.SetInt.resize(SetInt.java:236)
   at org.eclipse.mat.collect.SetInt.add(SetInt.java:58)
   at org.eclipse.mat.collect.SetInt.main(SetInt.java:252)
  .
  The problem exists, but won't occur when running on Java5, as
  the responsible optimization is not being used for all the
  purposes in this release as it is being used in later releases,
  and specifically, it is not being used for the case triggered by
  this test case. The optimization has been fixed in Java5 too
  never-the-less.
  

Local fix

• The failure can be avoided with the -Xjit:disableLookahead
  option.
  

Problem summary

• The problem occurs when the Java JIT compiler performs the class
  lookahead optimization on a compiled method and some very
  specific circumstances occur, e.g. a private method of the same
  class as the compiled method is being called by the compiled
  method as well as by the class constructor, and that private
  method changes a class field, which happens to be used by the
  compiled method before and after the call to that method.
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR9
  5.0.0 SR13
  .
  The optimization has been fixed to identify such situation and
  deal with it properly.
  .
  To obtain the fix:
  Install build 20101015 or later
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  IZ86717

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSN

     UP