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

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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 number

    IC65509

  • 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

    2010-01-11

  • Closed date

    2010-01-29

  • Last modified date

    2010-01-29

  • 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:
29 January 2010