IV47311: WEBSPHERE MQ CLASSES FOR JAVA/JMS ATTEMPT TO CREATE MORE SHARED CONVERSATIONS THAN THE CONFIGURED SHARECNV LIMIT ON A CONNECTION

WebSphere MQ V7.0 Fix Pack 7.0.1.12

APAR status

• Closed as program error.

Error description

• A channel has defined SHARECNV(10) and the client is trying to
  start an 11th conversation.
  
  At the z/OS qmgr we receive:
  CSQX504E -XGA1 CSQXRESP Local protocol error,
  channel GXPEKA01CL.TO.MQAX
  type=00000023 data=0000000B
  
  The CSQX504E with type 00000023 (rfpERR_MAX_CONVS_EXCEEDED) is
  being issued as the client is trying to start a new
  conversation, when the maximum number of conversations has
  already been reached.
  
  On distributed platforms an FDC with Probe Id
  RM557001 is seen with  with following information:
  
  | Major Errorcode   :- rrcE_PROTOCOL_ERROR
  | Minor Errorcode   :- OK
  | Probe Type        :- MSGAMQ9504
  | Probe Severity    :- 2
  | Probe Description :- AMQ9504: A protocol error was detected
  for channel ''. |
  

Local fix

• n/a
  

Problem summary

• ****************************************************************
  USERS AFFECTED:
  This issue affects users of:
  
  - The WebSphere MQ classes for JMS 7.0.1 client.
  - The WebSphere MQ V7.0.1 Resource Adapter.
  - The WebSphere Application Server V7 WebSphere MQ messaging
  provider.
  - The WebSphere Application Server V8 WebSphere MQ messaging
  provider.
  
  that are using multiplexed connections to the WebSphere MQ Queue
  Manager.
  
  Platforms affected:
  All Distributed (iSeries, all Unix and Windows) +Java +Java zOS
  ****************************************************************
  PROBLEM SUMMARY:
  A client application attempted to make a number of connections
  to the queue manager using a multiplexing enabled connection
  (SHARECNV >= 1). The number of concurrent threads attempting to
  obtain a connection was greater than the number of conversations
  supported on the connection.
  
  Due to the number of concurrent threads a timing window was
  encountered which caused the number of conversations created on
  the WMQ client side to be greater than the number of
  conversations allowed on the channel.
  

Problem conclusion

• This APAR resolves the issue by ensuring that the number of
  conversations created on the client side is less than or equal
  to the maximum number of conversations allowed on the channel.
  
  ---------------------------------------------------------------
  The fix is targeted for delivery in the following PTFs:
  
  Version    Maintenance Level
  v7.0       7.0.1.12
  
  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 LIN X86 V7

• Fixed component ID

  5724H7224

Applicable component levels