IZ76271: CLASS.FORNAME THROWS CLASSNOTFOUNDEXCEPTION WHEN REFLECTED AND J IT-COMPILED

APAR status

• Closed as program error.

Error description

• Error Message: A ClassNotFoundException is thrown (and re-thrown
  inside an InvocationTargetException) when Class.forName is
  called via reflection and the associated
  GeneratedMethodAccessorXXX.invoke method is compiled by the
  just-in-time compiler. XXX could be any number (depending on the
  number of reflected objects in the application). This problem
  could occur in both Java 5 and Java 6.
  .
  Stack Trace: java.lang.reflect.InvocationTargetException
          at sun.reflect.GeneratedMethodAccessor2.invoke(Unknown
  Source)
          at
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethod
  AccessorImpl.java:43)
          at java.lang.reflect.Method.invoke(Method.java:618)
          at LoadingClass.test(LoadingClass.java:18)
          ... 4 more
  Caused by: java.lang.ClassNotFoundException: hw
          at java.lang.Class.forNameImpl(Native Method)
          at java.lang.Class.forName(Class.java:130)
          ... 8 more
  .
  

Local fix

• This issue can be worked around using the
  -Xjit:disableInliningOfNatives option.
  

Problem summary

• The problem is caused by an optimization in the JIT compiler
  that attempts to speed up class loading. The optimization
  contains a bug which causes the compiled code to use an
  incorrect class loader when Class.forName is invoked.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR12
  6.0.0 SR9
  .
  The JIT compiler has been updated to produce correct code when
  performing this optimization.
  .
  To obtain the fix:
  Install build 20100529 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:

  IZ76301

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSN

     UP