Fixes are available
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:
31 March 2023