PM28508: SERVICE INTEGRATION BUS INTRA MESSAGING ENGINE CONNECTION RETRY LOGIC MAY STALL IF AN EXCEPTION OCCURS AT A CRITICAL POINT

6.1.0.37: Java SDK 1.5 SR12 FP3 Cumulative Fix for WebSphere
7.0.0.17: Java SDK 1.6 SR9 FP1 Cumulative Fix for WebSphere Application Server
6.1.0.47: WebSphere Application Server V6.1 Fix Pack 47
7.0.0.27: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
6.1.0.39: Java SDK 1.5 SR12 FP4 Cumulative Fix for WebSphere Application Server
6.1.0.41: Java SDK 1.5 SR12 FP5 Cumulative Fix for WebSphere Application Server
6.1.0.43: Java SDK 1.5 SR13 Cumulative Fix for WebSphere Application Server
6.1.0.45: Java SDK 1.5 SR14 Cumulative Fix for WebSphere Application Server
6.1.0.47: Java SDK 1.5 SR16 Cumulative Fix for WebSphere Application Server
7.0.0.19: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.21: Java SDK 1.6 SR9 FP2 Cumulative Fix for WebSphere
7.0.0.23: Java SDK 1.6 SR10 FP1 Cumulative Fix for WebSphere
7.0.0.25: Java SDK 1.6 SR11 Cumulative Fix for WebSphere Application Server
7.0.0.27: Java SDK 1.6 SR12 Cumulative Fix for WebSphere Application Server
7.0.0.29: Java SDK 1.6 SR13 FP2 Cumulative Fix for WebSphere Application Server
7.0.0.45: Java SDK 1.6 SR16 FP60 Cumulative Fix for WebSphere Application Server
7.0.0.31: Java SDK 1.6 SR15 Cumulative Fix for WebSphere Application Server
7.0.0.35: Java SDK 1.6 SR16 FP1 Cumulative Fix for WebSphere Application Server
7.0.0.37: Java SDK 1.6 SR16 FP3 Cumulative Fix for WebSphere Application Server
7.0.0.39: Java SDK 1.6 SR16 FP7 Cumulative Fix for WebSphere Application Server
7.0.0.41: Java SDK 1.6 SR16 FP20 Cumulative Fix for WebSphere Application Server
7.0.0.43: Java SDK 1.6 SR16 FP41 Cumulative Fix for WebSphere Application Server

APAR status

• Closed as program error.

Error description

• When a Messaging Engine attempts to establish a connection
  with another Messaging Engine in the same BUS, if an exception
  occurs at a critical point in the establishment of the
  connection, connection retry will stall and a connection
  between the messaging engines is never established.  Messages
  will not flow between these messaging engines and may build up
  on transmission queues.
  
  An FFDC at one of the messaging engines' server will have the
  following stack frame:
  
  com.ibm.ws.sib.comms.server.mesupport.METransportReceiveListener
  .rcvTRMExchange(METransportReceiveListener.java...)
  

Local fix

• Restart the messaging engine which issued the CWSIT0039E error.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of the default messaging provider for *
  *                  IBM WebSphere Application Server            *
  ****************************************************************
  * PROBLEM DESCRIPTION: Connection retry logic for              *
  *                      connections between messaging engines   *
  *                      in the same BUS may stall.              *
  ****************************************************************
  * RECOMMENDATION:  To recover from this situation, without     *
  *                  PM28508 applied, a restart of the messaging *
  *                  engine on the server where the FFDC is      *
  *                  dumped is required.                         *
  ****************************************************************
  The problem resulted from state that was not cleaned up as a
  result of the Exception.  Both messaging engines attempted to
  connect to each other, but only one connection was ever
  created.  When this problem occured, the messaging engine on
  the server which dumped the FFDC believed that connection
  establishment was in progress and so did not attempt to
  initiate a connection to the other messaging engine.  The
  messaging engine on which the FFDC was not dumped continued to
  retry the connection as per sib.trm.retry (default 30 seconds)
  but failed to establish a connection because it was told
  connection establishment was already in progress.
  

Problem conclusion

• This APAR ensures that the state is cleaned up when an
  exception occurs at the critical point highlighted by this
  problem.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 6.1.0.37 and 7.0.0.17.  Please refer to the
  Recommended Updates page for delivery information:
  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

  PLAT MSG COM

• Fixed component ID

  620600101

Applicable component levels

• R200 PSY

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