A fix is available
APAR status
Closed as program error.
Error description
An unexpected message being sent to the client when the wait interval for a browse first expires at the same time as a matching message arrives on the queue. Client tried to copy the message, and if it doesn't fit to application buffer, then ArrayIndexOutofBounds Exception occurs. It causes client connection to disconnect and CSQX209E is seen on CHINIT JOBLOG. . Additional Symptom(s) Search Keyword(s): MQJE001 2009 MQRC_CONNECTION_BROKEN
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All users of IBM MQ for z/OS Version 9 * * Release 0 Modification 0 and Release 1 * * Modification 0. * **************************************************************** * PROBLEM DESCRIPTION: Errors occur in client applications * * using MQGMO_BROWSE_FIRST and MQGMO_WAIT * * if messages arrive as the wait interval * * expires. * * MQ Java clients encounter an * * ArrayIndexOutofBounds exception, * * causing the channel to terminate. * * MQ C clients can return a message other * * than the first on the queue. * **************************************************************** An MQ client issues a request for messages, causing the channel initiator to establish a callback to wait for messages. When the WaitInterval expires, the client issues another request for a message, requesting a notification when it has been sent. If multiple messages arrive as this notification is sent, a serialisation error in updating the browse state of the consumer can result in both the consumer thread and the receive thread sending a message to the client between the 2nd message request and the notification. This is not expected by the client, leading to incorrect behaviour with symptoms that vary depending on the client implementation.
Problem conclusion
The serialisation error relating to the browse state of the consumer is corrected, preventing the 2nd message being sent under these circumstances.
Temporary fix
Comments
APAR Information
APAR number
PH04226
Reported component name
IBM MQ Z/OS V9
Reported component ID
5655MQ900
Reported release
000
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2018-10-18
Closed date
2018-11-15
Last modified date
2019-01-02
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UI59739 UI59740
Modules/Macros
CMQXRSTF
Fix information
Fixed component name
IBM MQ Z/OS V9
Fixed component ID
5655MQ900
Applicable component levels
Fix is available
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Document Information
Modified date:
02 January 2019