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IC88691: WEBSPHERE MQ .NET APPLICATION WITH CLIENT AUTOMATIC RECONNECT ENABLED THROWS A NULLREFERENCEEXCEPTION DURING RECONNECT

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APAR status

  • Closed as program error.

Error description

  • When using WebSphere MQ .Net application with client automatic
    reconnection enabled, after a broken connection a
    NullReferenceException is thrown during a reconnection attempt.
    
    XMS trace shows NullReferenceException is thrown from Reconnect
    method:
    
    [16/11/2012 20:40:57:339933 ] 00000011 d UOW=
    source=IBM.WMQ.Nmqi.MQManagedReconnectableThread Exception in
    method Run()
    [16/11/2012 20:40:57:339933 ] 00000011 X UOW=
    source=IBM.WMQ.Nmqi.MQManagedReconnectableThread
    System.NullReferenceException: Object reference not set to an
    instance of an object.
    at
    IBM.WMQ.Nmqi.MQManagedReconnectableThread.Reconnect
    (ManagedHconn remoteHconn)
    at IBM.WMQ.Nmqi.MQManagedReconnectableThread.Run()
    [16/11/2012 20:40:57:371183 ] 00000011 > UOW=
    source=IBM.WMQ.Nmqi.MQManagedReconnectableThread
    method=FFST(String,string,string,uint,uint,MQULONG,MQULONG,
    ushort)
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects users of the WebSphere MQ .Net application
    where client automatic reconnect functionality has been enabled.
    
    Platforms affected:
    Windows
    
    ****************************************************************
    PROBLEM SUMMARY:
    When WebSphere MQ .Net application is enabled with client
    automatic reconnection and a remote connection has been broken
    before any asynchronous messaging had occurred, waking the
    dispatcher thread that handles asynchronous message consumption
    results in NullReferenceException as this thread would not have
    been created.
    

Problem conclusion

  • The code has been altered to ensure the asynchronous message
    consume dispatch thread has been created prior to the broken
    connect, waking it only in the case it exists. This change
    prevents the NullReferenceException from occurring.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.1
    Platform           Fix Pack 7.1.0.3
    --------           --------------------
    Windows            7.1.0.3
    
    Platform           v7.5
    --------           --------------------
    Multiplatforms     7.5.0.1
    
    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

    IC88691

  • Reported component name

    WMQ WINDOWS V7

  • Reported component ID

    5724H7220

  • Reported release

    710

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-11-28

  • Closed date

    2012-11-30

  • Last modified date

    2012-11-30

  • 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

  • R710 PSY

       UP

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Document Information

Modified date:
30 November 2012