IC65509: A HANG CONDITION OCCURS IF THE MESSAGE CONSUMER CLOSE OCCURS WHILST A MESSAGE IS BEING PROCESSED BY A MESSAGE LISTENER.

WebSphere MQ V7.0 Fix Pack 7.0.1.2
WebSphere MQ V7.0.1 for i5/OS Fix Pack 7.0.1.2

APAR status

• Closed as program error.

Error description

• The problem is found while using the MicroBroker Java Message
  Service (JMS) client that extends the common client module of
  WebSphere MQ, but also occurs in the WebSphere MQ classes for
  JMS.
  
  A hang condition occurs if the MessageConsumer.close() method
  is called whilst a message is being processed by an associated
  message listener.
  

Local fix

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of WebSphere MQ classes for JMS or
  MicroBroker who utilise asynchronous message delivery
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows) +Java
  ****************************************************************
  PROBLEM SUMMARY:
  The hang condition arises as the asynchronous message delivery
  thread holds a lock that the MessageConsumer.close method
  requires to complete. The MessageConsumer.close method also
  holds a lock that prevents any calls to the underlying JMS
  Session from completing. If a call to the JMS Session is made
  from the onMessage method, such as commit(), this will block and
  prevent the onMessage method from completing, so a hang
  condition arises.
  

Problem conclusion

• The locking model has been altered to prevent the problem from
  occurring.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
                     v7.0
  Platform           Fix Pack 7.0.1.2
  --------           --------------------
  Windows            U200316
  AIX                U829807
  HP-UX (PA-RISC)    U829678
  HP-UX (Itanium)    U829681
  Solaris (SPARC)    U829806
  Solaris (x86-64)   U829680
  iSeries            tbc_p700_0_1_2
  Linux (x86)        U829677
  Linux (x86-64)     U829676
  Linux (zSeries)    U829682
  Linux (Power)      U829679
  
  The latest available maintenance can be obtained from
  'WebSphere MQ Recommended Fixes'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006037
  
  If the maintenance level is not yet available, information on
  its planned availability can be found in 'WebSphere MQ
  Planned Maintenance Release Dates'
  http://www-1.ibm.com/support/docview.wss?rs=171&uid=swg27006309
  ---------------------------------------------------------------
  

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

  WMQ WINDOWS V7

• Fixed component ID

  5724H7220

Applicable component levels

• R700 PSY

     UP