APAR status
Closed as program error.
Error description
The IBM MQ Explorer generates dump files. Running a memory analysis tool against these core dumps shows the following: Possible failure detected in module C:\Windows\System32\ntdll.dll Out of memory detected Executable: C:\Program Files\IBM\WebSphere MQ\bin64\MQExplorer.exe 52: java/util/Hashtable.rehash ()V(564) 51: java/util/Hashtable.put (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;(628) 50: com/ibm/mq/explorer/ui/internal/controls/ExtTableGreyCellManager .getGreyCellListFromHashtable (Lcom/ibm/mq/commonservices/internal/trace/Trace;Lcom/ibm/mq/exp lorer/ui/extensions/MQExtObject;)Ljava/util/ArrayList;
Local fix
Problem summary
**************************************************************** USERS AFFECTED: This issue affects users of - IBM MQ Explorer V8.0 - IBM MQ Explorer V9.0 Platforms affected: Linux on x86, Linux on x86-64, Windows **************************************************************** PROBLEM DESCRIPTION: The IBM MQ Explorer displays MQ objects in its content view tables. One of the data structures that is used to determine what is displayed in each content view table is the grey cell Hashtable. This Hashtable records which cells for each individual object shown should be greyed out. Cells are greyed out if the property, which would otherwise be displayed in that cell, is not applicable to that object. For example, the "Remote queue" property is not valid for a local queue, so this cell is greyed out for any local queues displayed in the queue content view table. Entries are added to this grey cell Hashtable each time a new MQ object is created. Entries representing each MQ object are also added to this Hashtable each time the content view table is redrawn. Each time a redraw event happens the internal table representing the objects in the content view table is cleared and regenerated. Examples of when this happens include when the table is refreshed, when a filter is applied or when moving between types of objects. However, the grey cell Hashtable was not cleared when the internal object table was cleared, and entries were not removed when MQ objects were deleted. This resulted in the Hashtable growing over time, eventually leading to an out of memory event if the MQ Explorer was left open for sufficient duration.
Problem conclusion
The IBM MQ Explorer code has been updated to remove the appropriate entry from the grey cell Hashtable when an MQ object is deleted. It has also been update to clear the contents of the grey cell Hashtable each time the internal representation of the list of objects in the MQ Explorer table is cleared. --------------------------------------------------------------- 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
IT20487
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
2017-05-07
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