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IC71824: UNRECOGNISED ACK EXCEPTION WHEN JMS MESSAGE CONSUMER CONFIRMS MESSAGE RECEIPT WHILE ANOTHER THREAD CLOSES THE MESSAGE PRODUCER

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APAR status

  • Closed as program error.

Error description

  • The JMS Client reports an exception - Unrecognised ACK - when
    the message consumer is confirming a receipt of a message and
    in parallel there is another thread where the message producer
    is closed.
    
    This issue was reported in micro broker which returns
    error java.lang.Exception: Unrecognised ACK. MsgId:8 AckType:8
    SessionID:1
    
    The close message producer should be blocked until the
    onMessage call completes.
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects users of the WebSphere MQ classes for Java
    Message Service (JMS) or the micro broker JMS client
    component who utilize the asynchronous message delivery
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows) +Java
    ****************************************************************
    PROBLEM SUMMARY:
    The problem occurs due to the message producer attempting to
    close in parallel to confirming the receipt of the message by
    the message listener in another thread.
    
    The issue occurs only if the message producer and the consumer
    are on the same session and the message producer is closed
    before closing the message consumer.
    
    Also this issue will not occur if the connection is
    stopped before closing the message producer or if the message
    consumer is used in a synchronous mode.
    

Problem conclusion

  • The fix ensures that the message producer blocks on the close
    call until the message listener completes confirming the receipt
    of the message.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.5
    --------           --------------------
    Windows            U200324
    AIX                U839183
    HP-UX (PA-RISC)    U839621
    HP-UX (Itanium)    U839626
    Solaris (SPARC)    U839622
    Solaris (x86-64)   U839628
    iSeries            tbc_p700_0_1_5
    Linux (x86)        U839623
    Linux (x86-64)     U839627
    Linux (zSeries)    U839624
    Linux (Power)      U839625
    
    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 number

    IC71824

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    700

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-10-11

  • Closed date

    2010-10-15

  • Last modified date

    2010-10-15

  • 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

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Document Information

Modified date:
15 October 2010