APAR status
Closed as program error.
Error description
The NPE causes the channel to fail. It takes manual intervention to get it going again. . The logs report: 7/18/17 14:23:52.467 AMQXR0022I: Client 'client name' previously connected at network address 'ipaddress' now connected at 'ipaddress'. 7/18/17 14:23:53.276 AMQUT1003I: 30 instances of message 'AMQXR0022I:' were suppressed. 7/18/17 14:23:53.275 AMQCO2001E: An error (probe: XR014005) occurred and a Failure Data Capture (FDC) file has been written to file '/var/mqm/errors/MQXR0.FDC'. 7/18/17 14:23:54.308 AMQCO1006I: Channel 'channelname' has stopped 7/18/17 15:51:50.408 AMQXR0016I: Channel 'channelname' has started . The FDC reports a NPE. . java.lang.NullPointerException at com.ibm.mq.MQXRService.MQTTServerSession.purge (MQTTServerSession.java:462) at com.ibm.mq.MQXRService.MQTTServerContext.close (MQTTServerContext.java:225) at com.ibm.mq.communications.NonBlockingConnection.closeFinal (NonBlockingConnection.java:667) at com.ibm.mq.communications.NonBlockingConnection.sendRemainder (NonBlockingConnection.java:338) at com.ibm.mq.communications.NonBlockingWorker.run (NonBlockingWorker.java:402) at java.lang.Thread.run(Thread.java:809)
Local fix
NA
Problem summary
**************************************************************** USERS AFFECTED: The issue affects the users of: - IBM MQ Telemetry (MQXR) service V8 - IBM MQ Telemetry (MQXR) service V9 who have a client connecting to the MQXR service. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: There was a small timing window where if a MQTT client request is being made to close the client connection that got just got closed by another thread on the MQXR service, a close request was made on the closed connection object, which resulted in a NullPointerException. This exception caused the MQXR channel to stop and cut probe XR014005.
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 CD 9.0.5 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
IT21548
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
2017-07-21
Closed date
2017-10-31
Last modified date
2017-10-31
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:
31 October 2017