Fixes are available
APAR status
Closed as program error.
Error description
When multiple threads from a WMQ Base Java application attempt to connect to the available queue managers that are listed in a CCDT, if weights have been assigned to the client channels and Affinity has been set to NONE, then an IllegalArgumentException is thrown. The error thrown on the console is something like this: java.lang.IllegalArgumentException: n must be positive at java.util.Random.nextInt(Random.java:250)
Local fix
Change the CCDT to use AFFINITY=PREFERRED and varying client weight (CLNTWGHT).
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users of multi-threaded WebSphere MQ (WMQ) v7 classes for Java and WMQ classes for Java Message Service (JMS) applications which try to connect to a queue manager using a CCDT with weights assigned to client channels and AFFINITY on the client channels set to NONE. Platforms affected: All Distributed (iSeries, all Unix and Windows) +Java **************************************************************** PROBLEM SUMMARY: When a WMQ Java/JMS application attempts to connect to a queue manager using a CCDT, the process of selecting a suitable weighted channel takes place. Because of multiple threads trying to do the same task during the channel selection process, when one thread was about to choose a channel, the other thread would modify certain properties and this would result in these values of those properties being incorrect; thus resulting in the IllegalArgumentException.
Problem conclusion
The channel selection process has now been serialized and the IllegalArgumentException is no longer seen. Note that the use of CCDTs within XA transactions is not supported due to issues with transaction recovery. For more infomation, please see technote 1249798: http://www-01.ibm.com/support/docview.wss?uid=swg21249798 --------------------------------------------------------------- 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
IC71366
Reported component name
WMQ WINDOWS V7
Reported component ID
5724H7220
Reported release
701
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2010-09-23
Closed date
2010-10-26
Last modified date
2011-03-04
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
R701 PSY
UP
[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSDEZSF","label":"IBM WebSphere MQ Managed File Transfer for z\/OS"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"7.0.1","Edition":"","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
31 March 2023