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IC60797: CLASSCASTEXCEPTION WHEN RECEIVING A MESSAGE FROM A TEMPORARY QUEUE OR TOPIC

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APAR status

  • Closed as program error.

Error description

  • A WebSphere MQ v7 JMS application receiving a message from a
    temporary queue or topic gets a ClassCastException similar to:
    
    java.lang.ClassCastException :
    com.ibm.msg.client.jms.internal.JmsTemporaryQueueImpl
    incompatible with com.ibm.mq.jms.MQQueue
    at
    com.ibm.mq.jms.MQQueueReceiver.getQueue(MQQueueReceiver.java:98)
    
    when calling getQueue() or getTopic()
    .
    ADDITIONAL KEYWORDS:
    JmsTemporaryQueueImpl
    

Local fix

Problem summary

  • ****************************************************************
    USERS AFFECTED:
    This issue affects users of the WebSphere MQ v7 JMS client
    calling MQQueueReceiver.getQueue(), MQQueueBrowser.getQueue() or
    MQTopicSubscriber.getTopic() when receiving a message from a
    temporary queue or topic.
    
    Platforms affected:
    All Distributed (iSeries, all Unix and Windows) +Java
    ****************************************************************
    PROBLEM SUMMARY:
    The problem occurred because the common client code held a
    JmsTemporaryQueue if the queue was a temporary one, and a
    JmsQueue if it was not. In the non-temporary case, the returned
    queue could be cast to an MQQueue; JmsTemporaryQueue did not
    inherit from MQQueue and so could not be cast correctly.
    

Problem conclusion

  • When one of the methods showing the problem obtains a temporary
    queue or topic from the common client code, this will be wrapped
    in a MQTemporaryQueue or MQTemporaryTopic wrapper class to
    ensure that the returned class type is correct.
    
    ---------------------------------------------------------------
    The fix is targeted for delivery in the following PTFs:
    
                       v7.0
    Platform           Fix Pack 7.0.1.0
    --------           --------------------
    Windows            U200306
    AIX                U823774
    HP-UX (PA-RISC)    U823665
    HP-UX (Itanium)    U823667
    Solaris (SPARC)    U823772
    Solaris (x86-64)   U824344
    iSeries            tbc_p700_0_1_0
    Linux (x86)        U823664
    Linux (x86-64)     U823773
    Linux (zSeries)    U823668
    Linux (Power)      U823666
    
    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

    IC60797

  • 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

    2009-04-16

  • Closed date

    2009-04-30

  • Last modified date

    2010-01-13

  • 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:
13 January 2010