IV77917: INCOMPATIBLECLASSCHANGEERROR THROWN WHEN CALLING AN INTERFACE OR VIRTUAL METHOD

APAR status

• Closed as program error.

Error description

• Error Message: An unexpected Java IncompatibleClassChangeError
  exception is thrown in a JIT compiled method
  .
  Stack Trace: N/A
  .
  

Local fix

• The problem can be avoided with the Java option
  -Xjit:disableInvariantArgumentPreexistence
  Note that this may affect performance.
  

Problem summary

• The problem happens because the JIT compiler propagates the sub
  class type information of an argument without considering the
  case where the Java code could change the argument to a
  different value with a different sub class type.
  

Problem conclusion

• The JIT compiler has been updated to stop propagating incorrect
  type information when the Java code changes the argument sub
  class type.
  .
  This APAR will be fixed in the following Java Releases:
     8    SR2       (8.0.2.0)
  .
  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:

Fix information

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

     UP