APAR status
Closed as program error.
Error description
NullPointerException causes the IBM MQ Telemetry service to end, disconnecting all connected clients. An FDC is generated with following symptom: Thread :- name=ServerWorker0 priority=5 group=main ccl=sun.misc.Launcher$AppClassLoader@ca2651dc Source Class :- com.ibm.mq.communications.NonBlockingWorker Source Method :- run Probe Id :- XR014005 FileInformation :- C:\ProgramData\IBM\MQ\errors\MQXRxxx.FDC Suppressed Count:- 0 JavaDump file :- null Thread :- ServerWorker0 Mem Max/Free/Tot:- xxxxxxxx / xxxxxxx / xxxxxxxx Loaded from :- jar:file:/C:/ibm/mq/mqxr/lib/MQXRListener.jar! /com/ibm/mq/communications/NonBlockingWorker.class ---------------------------------------------------------------- java.lang.NullPointerException at com.ibm.mq.MQXRService.MQSubscriptionWrapper.subWithOptions (MQSubscriptionWrapper.java:340) at com.ibm.mq.MQXRService.MQSubscriptionWrapper.doNextRemainingWork (MQSubscriptionWrapper.java:658) at com.ibm.mq.MQXRService.MQTTServerSession.doFollowOnWork (MQTTServerSession.java:1515) at com.ibm.mq.MQXRService.WorkerContext.doFollowOnWork (WorkerContext.java:669) at com.ibm.mq.MQXRService.WorkerContext.synchronousWorkCompleted (WorkerContext.java:326) at com.ibm.mq.communications.NonBlockingWorker.synchronousWorkCompl eted(NonBlockingWorker.java:620) at com.ibm.mq.communications.NonBlockingWorker.run (NonBlockingWorker.java:422) at java.lang.Thread.run(Thread.java:809)
Local fix
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users connecting to the queue manager's MQTT channel and making subscriptions. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: There was a small timing window where if a subscription request being made for a MQTT client coincided with the connection closing, a subscription request was made on the closed connection object, intermittently resulting in a NullPointerException. This exception caused the MQTT service to end.
Problem conclusion
The timing window where the NullPointerException could occur has been removed, and the exception no longer occurs. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v8.0 8.0.0.9 v9.0 LTS 9.0.0.3 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
IT19024
Reported component name
WMQ BASE MULTIP
Reported component ID
5724H7251
Reported release
800
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2017-01-30
Closed date
2017-11-28
Last modified date
2017-11-28
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 BASE MULTIP
Fixed component ID
5724H7251
Applicable component levels
R800 PSY
UP
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Document Information
Modified date:
28 November 2017