IV37444: NULLPOINTEREXCEPTION IS THROWN WHILE SETTING INTERESTOPS ON CLOS ED SELECTOR

APAR status

• Closed as program error.

Error description

• Error Message: java.lang.NullPointerException is thrown from
  putEventOps() that is called while setting interestOps on a
  SelectionKey when the corresponding selector gets closed.
  .
  Stack Trace: java.lang.NullPointerException
   at
  sun.nio.ch.AbstractPollSelectorImpl.putEventOps(AbstractPollSele
  ctorImpl.java:59)
   at
  sun.nio.ch.ServerSocketChannelImpl.translateAndSetInterestOps(Se
  rverSocketChannelImpl.java:363)
   at
  sun.nio.ch.SelectionKeyImpl.nioInterestOps(SelectionKeyImpl.java
  :114)
   at
  sun.nio.ch.SelectionKeyImpl.interestOps(SelectionKeyImpl.java:65
  )
   at BlockIntOpsReg.test1(BlockIntOpsReg.java:57)
   at DelayRegisterServer.main(DelayRegisterServer.java:378)
  .
  

Local fix

• Application to ensure the selector is not closed while
  registering the interstOps
  

Problem summary

• When a selector is closed, the corresponding object attributes
  are set to null. While trying to set interestOps on a closed
  selector, NullPointerException is thrown instead of throwing
  ClosedSelectorException
  

Problem conclusion

• This defect will be fixed in:
  6.0.0 SR14
  6.0.1 SR6
  .
  The JDK has been updated to throw ClosedSelectorException
  instead of NullPointerException.
  

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

• R600 PSY

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