PH18475: CLIENT RECEIVED 'HTTP 500 ERROR' FOR THEIR REQUEST DUE TO JAVA.LANG.ILLEGALSTATEEXCEPTION IN THE CR

9.0.5.3: WebSphere Application Server traditional Version 9.0.5 Fix Pack 3

APAR status

• Closed as program error.

Error description

• Client received 'HTTP 500 ERROR' for their request.Joblog and
  FFDC in CR showed java.lang.IllegalStateException.
  .
  After looking at the trace, this looks like a timing issue. When
  a new http request comes in, if there is not enough data to
  queue the request, the read goes async. The initial thread doing
  the read will unwind and allow another thread to come and
  continue the read request. During this window, if a second
  thread picks up the request and gets far enough along to mark
  the request as "readCompleted", both threads may attempt to
  queue the request to WLM.
  

Local fix

• Retry the client request.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server                                      *
  *                  V9.0                                        *
  ****************************************************************
  * PROBLEM DESCRIPTION: HTTP 500 error returned due             *
  *                      to java.lang.IllegalStateException in   *
  *                      the control region.                     *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  When an initial read for an incoming HTTP request goes
  async, there is a window of time where a second thread may
  continue the read before the first thread exits. During this
  time, the initial thread performs a read complete check which
  may be a false positive if the second thread gets far enough
  along in the read. This could result in both threads attempting
  to queue the request to WLM and an IllegalStateException may
  occur.
  

Problem conclusion

• Code has been modified to remove this read complete check if
  the read request goes async.
  
  The fix for this APAR is targeted for inclusion in fix pack
  9.0.5.3.  For more information, see 'Recommended Updates for
  WebSphere Application Server':
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

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

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R900 PSY

     UP