IZ74152: JAVA JIT PPC64 - ARRAYSTOREEXCEPTION DUE TO AN ARRAY BEING OF TH E INCORRECT CLASS LOADER

APAR status

• Closed as program error.

Error description

• Error Message: ArrayStoreException
  .
  Stack Trace: N/A
  .
  The problem is mostly likely to occur during the construction of
  an object using the Class.newInstance() API. You need to have
  two class loaders both having loaded a class of the same name.
  Inlining must occur and the class loader of the method being
  compiled must be different to the class loader of the inlined
  method that is creating the object.
  The problem only effects 64bit PPC JVM builds (AIX and
  LinuxPPC).
  

Local fix

• You can disable inlining (-Xjit:disableInlining) but that may
  have a substantial impact on performance. All known cases of the
  problem so far can be avoided by excluding the compilation of
  some special methods using the following option.
  -Xjit:exclude={*.newInstancePrototype*}
  This option has less performance impact, but will not avoid the
  problem in some theoretical situations.
  

Problem summary

• When the JIT attempts to reuse a constant table slot it can
  incorrectly obtain the class loader of a class constant allowing
  it to use the incorrect class constant for new object creation.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR12
  6.0.0 SR8 FP1
  .
  The JIT was modified to prevent the use of the a mismatching
  class loader.
  .
  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:

  IZ74191

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSN

     UP