IZ52037: JAVA.LANG.NULLPOINTEREXCEPTION AT JAVA.LANG.THREAD.INTERRUPT

APAR status

• Closed as program error.

Error description

• Error Message: java.lang.NullPointerException
  at java.lang.Thread.interrupt(Thread.java:558)
          at InterruptTest.main(InterruptTest.java:52)
  .
  Stack Trace: N/A
  .
  

Local fix

Problem summary

• A java.lang.NullPointerException exception can be triggered when
  using java.nio classes due to a volatile field in Thread. In the
  case where there are many multiple threads writing to that
  field, one thread may check is that field null, and get the
  answer 'no', while another thread sets it to null, so when the
  first thread goes to use the null field, it throws a
  java.lang.NullPointerException exception.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR10
  6.0.0 SR6
  .
  Change the problem field such that it is no longer volatile.
  .
  To obtain the fix:
  Install build 20090527 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:

  IZ52134

Fix information

• Fixed component name

  JAVA 5 J9 COMMO

• Fixed component ID

  620500127

Applicable component levels

• R500 PSN

     UP