APAR status
Closed as program error.
Error description
The MQTT channel ends with an error in the log: AMQCO2001E: An error (probe: XR014005) occurred and a Failure Data Capture (FDC) file has been written to file 'MQXR2.FDC'. AMQCO1006I: Channel 'XXXXXXXX' has stopped and an FDC generated with details: Probe Id :- XR014005 java.lang.NullPointerException at com.ibm.mq.MQXRService.MQTTServerSessionV3.handleReceive(MQTTSer verSessionV3.java:258) at com.ibm.mq.MQXRService.HttpServerContext.handleReceive(HttpServe rContext.java:235) at com.ibm.mq.MQXRService.HttpServerContext.handleWebSocketFrame(Ht tpServerContext.java:174) at com.ibm.mq.http.HttpWireContext.receiveWebsocketFrame(HttpWireCo ntext.java:563) at com.ibm.mq.http.HttpWireContext.receive(HttpWireContext.java:196 ) at com.ibm.mq.communications.NonBlockingConnection.receive(NonBlock ingConnection.java:386) at com.ibm.mq.communications.NonBlockingWorker.run(NonBlockingWorke r.java:398) at java.lang.Thread.run(Thread.java:818)
Local fix
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users of the MQTT channel service. Platforms affected: MultiPlatform **************************************************************** PROBLEM DESCRIPTION: The MQTT channel service may stop unexpectedly due to a NULLPOINTEREXCEPTION. It will also generate a Failure Data Capture (FDC) file, which will contain the following java stack: java.lang.NullPointerException at com.ibm.mq.MQXRService.MQTTServerSessionV3.handleReceive(MQTTSer verSessionV3.java:258) at com.ibm.mq.MQXRService.HttpServerContext.handleReceive(HttpServe rContext.java:235) at com.ibm.mq.MQXRService.HttpServerContext.handleWebSocketFrame(Ht tpServerContext.java:174) at com.ibm.mq.http.HttpWireContext.receiveWebsocketFrame(HttpWireCo ntext.java:563) at com.ibm.mq.http.HttpWireContext.receive(HttpWireContext.java:196 ) at com.ibm.mq.communications.NonBlockingConnection.receive(NonBlock ingConnection.java:386) at com.ibm.mq.communications.NonBlockingWorker.run(NonBlockingWorke r.java:398) at java.lang.Thread.run(Thread.java:818) ```
Problem conclusion
The code has been changed to avoid this Null Pointer Exception and prevent the unexpected shutdown of the MQTT channel service for this particular issue. --------------------------------------------------------------- The fix is targeted for delivery in the following PTFs: Version Maintenance Level v9.0 LTS 9.0.0.11 v9.1 LTS 9.1.0.8 v9.2 LTS 9.2.0.2 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
IT31909
Reported component name
IBM MQ BASE MP
Reported component ID
5724H7271
Reported release
910
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2020-02-19
Closed date
2020-10-13
Last modified date
2020-10-13
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
IBM MQ BASE MP
Fixed component ID
5724H7271
Applicable component levels
[{"Line of Business":{"code":"LOB45","label":"Automation"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSYHRD","label":"IBM MQ"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"910"}]
Document Information
Modified date:
14 October 2020