IV35456: CLASSCASTEXCEPTION FROM JDI

APAR status

• Closed as program error.

Error description

• Error Message: java.lang.ClassCastException:
  com.sun.tools.jdi.ObjectReferenceImpl incompatible with
  com.sun.tools.jdi.ThreadReferenceImpl
  .
  Stack Trace: Exception in thread "event-handler"
  java.lang.ClassCastException:
  com.sun.tools.jdi.ObjectReferenceImpl incompatible with
  com.sun.tools.jdi.ThreadReferenceImpl
          at
  com.sun.tools.jdi.VirtualMachineImpl.threadMirror(VirtualMachine
  Impl.java:1362)
          at
  com.sun.tools.jdi.PacketStream.readThreadReference(PacketStream.
  java:458)
          at
  com.sun.tools.jdi.JDWP$Event$Composite$Events$MethodEntry.<init>
  (JDWP.java:7597)
          at
  com.sun.tools.jdi.JDWP$Event$Composite$Events.<init>(JDWP.java:7
  394)
          at
  com.sun.tools.jdi.JDWP$Event$Composite.<init>(JDWP.java:8453)
          at
  com.sun.tools.jdi.EventSetImpl.build(EventSetImpl.java:620)
          at
  com.sun.tools.jdi.EventQueueImpl.removeUnfiltered(EventQueueImpl
  .java:223)
          at
  com.sun.tools.jdi.EventQueueImpl.remove(EventQueueImpl.java:108)
          at
  com.sun.tools.jdi.EventQueueImpl.remove(EventQueueImpl.java:94)
          at
  com.sun.tools.example.trace.EventThread.run(EventThread.java:93)
  Exception in thread "JDI Internal Event Handler"
  java.lang.ClassCastException:
  com.sun.tools.jdi.ObjectReferenceImpl incompatible with
  com.sun.tools.jdi.ThreadReferenceImpl
          at
  com.sun.tools.jdi.VirtualMachineImpl.threadMirror(VirtualMachine
  Impl.java:1362)
          at
  com.sun.tools.jdi.PacketStream.readThreadReference(PacketStream.
  java:458)
          at
  com.sun.tools.jdi.JDWP$Event$Composite$Events$MethodEntry.<init>
  (JDWP.java:7597)
          at
  com.sun.tools.jdi.JDWP$Event$Composite$Events.<init>(JDWP.java:7
  394)
          at
  com.sun.tools.jdi.JDWP$Event$Composite.<init>(JDWP.java:8453)
          at
  com.sun.tools.jdi.EventSetImpl.build(EventSetImpl.java:620)
          at
  com.sun.tools.jdi.EventQueueImpl.removeUnfiltered(EventQueueImpl
  .java:223)
          at
  com.sun.tools.jdi.EventQueueImpl.removeInternal(EventQueueImpl.j
  ava:136)
          at
  com.sun.tools.jdi.InternalEventHandler.run(InternalEventHandler.
  java:66)
          at java.lang.Thread.run(Thread.java:780)
  .
  

Local fix

Problem summary

• The problem is caused when a thread java method under debugging
  is returning a thread reference, but the debugger will receive a
  object reference.
  

Problem conclusion

• This defect will be fixed in:
  7.0.0 SR4
  6.0.0 SR13
  6.0.1 SR5
  .
  JDWP module has been updated to produce accurate type
  information for return type of method.
  

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

  JAVA CLASS LIBS

• Fixed component ID

  620700130

Applicable component levels

• R700 PSY

     UP

• R600 PSY

     UP