IZ90414: WINDOWS: NULLPOINTEREXCEPTION RUNNING SELECTOR.SELECT()

APAR status

• Closed as program error.

Error description

• Error Message: NullPointerException
  .
  Stack Trace: Exception in thread "ServerWorker1"
  java.lang.NullPointerException
          at
  sun.nio.ch.WindowsSelectorImpl.implDereg(WindowsSelectorImpl.jav
  a:653)
          at
  sun.nio.ch.SelectorImpl.processDeregisterQueue(SelectorImpl.java
  :168)
          at
  sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java
  :205)
          at
  sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:99)
          at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:110)
          at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:114)
          at
  com.ibm.mq.communications.NonBlockingServerWorker.run(NonBlockin
  gServerWorker.java:110)
   at java.lang.Thread.run(Thread.java:811)
  .
  NA
  

Local fix

• Problem is not observed with ipV4 stack enabled. Use JVM
  argument -Djava.net.preferIPv4Stack=TRUE as a workaround
  

Problem summary

• java.lang.NullPointerException thrown during nio channel
  selection process. NPE was seen to be thrown while one of
  channel which is not registered was tried to get accessed during
  deregistering process.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR12 FP3
  .
  JVM is updated to deregister only the registered channels and
  there by avoid the null pointer exception
  .
  To obtain the fix:
  Install build 20110106 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:

  IZ97564

Fix information

• Fixed component name

  JAVA 5 CLASS LI

• Fixed component ID

  620500130

Applicable component levels

• R500 PSN

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