Direct links to fixes
APAR status
Closed as program error.
Error description
When many services run with service result caching enabled, a ConcurrentModificationException might occur in the system log file with the following message: CWLLG0594E: An exception occurred while initializing the runnable thread. Error: java.util.ConcurrentModificationException The exception stack trace looks similar to the following exception stack trace: java.util.ConcurrentModificationException at java.util.LinkedHashMap$AbstractMapIterator. checkConcurrentMod(LinkedHashMap.java:136) at java.util.LinkedHashMap$AbstractMapIterator.makeNext (LinkedHashMap.java:141) at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap. java:188) at java.util.LinkedHashMap$EntryIterator.next(LinkedHashMap. java:180) at com.ibm.bpm.server.service.cache.ServiceResultCache. removeExpiredResults(ServiceResultCache.java:176) at com.ibm.bpm.server.service.cache.ServiceResultCache. add(ServiceResultCache.java:87) at com.lombardisoftware.server.ejb.workflow. EJBWorkflowManagerBean.doResumeWorkflowEngine (EJBWorkflowManagerBean.java:1599) at com.lombardisoftware.server.ejb.workflow. EJBWorkflowManagerBean.runProcess(EJBWorkflowManagerBean. java:555) at com.lombardisoftware.server.ejb.workflow. EJSRemoteStatefulEJBWorkflowManager_82478d70. runProcess(Unknown Source) at com.lombardisoftware.server.ejb.workflow. _EJBWorkflowManagerInterface_Stub.runProcess (_EJBWorkflowManagerInterface_Stub.java:772) at com.ibm.bpm.rest.impl.service.ServiceRunner$Service. runService(ServiceRunner.java:704) at com.ibm.bpm.rest.impl.service.StartActionHandler. handleAction(StartActionHandler.java:219) at com.ibm.bpm.rest.impl.service.ServiceResource. postServiceActions(ServiceResource.java:409)
Local fix
Problem summary
An iterator removes expired entries from the LinkedHashMap, which is used for the service result cache. You see a ConcurrentModificationException when the next action on the iterator is done because entries are removed from the map using the remove method of the map instead of using the remove method of the iterator. The documentation of LinkedHasMap describes that when using iterators the map needs to be modified using the iterator methods.
Problem conclusion
A fix is available for IBM BPM V8.5.0.1 that removes the expired entries correctly from the service result cache. On Fix Central (http://www.ibm.com/support/fixcentral), search for JR52097: 1. Select IBM Business Process Manager with your edition from the product selector, the installed version to the fix pack level, and your platform, and then click Continue. 2. Select APAR or SPR, enter JR52097, and click Continue. When you download fix packages, ensure that you also download the readme file for each fix. Review each readme file for additional installation instructions and information about the fix.
Temporary fix
Not applicable
Comments
APAR Information
APAR number
JR52097
Reported component name
BPM STANDARD
Reported component ID
5725C9500
Reported release
850
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt
Submitted date
2014-12-17
Closed date
2015-02-16
Last modified date
2015-02-16
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
BPM STANDARD
Fixed component ID
5725C9500
Applicable component levels
R850 PSY
UP
[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSFTDH","label":"IBM Business Process Manager Standard"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"8.5","Line of Business":{"code":"LOB45","label":"Automation"}}]
Document Information
Modified date:
14 October 2021