[jboss-jira] [JBoss JIRA] Updated: (JBRULES-1770) IndexOutOfBoundsException with subflows while removing listener from RuleFlowEventSupport

[Mark Proctor (JIRA)]

     [ https://jira.jboss.org/browse/JBRULES-1770?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Proctor updated JBRULES-1770:
----------------------------------

    Fix Version/s: 5.2.0.M1
                       (was: 4.0.8)


These issues where all marked for 4.0.8, we no longer maintain the 4.0.x branch in the community. I'm moving them to 5.2.0.M2, so they can be checked that they no longer cause a problem there, and fixed if they do. If you require these fixed at the 4.0.x branch level, then please contact sales at jboss.com for subscription based support.

> IndexOutOfBoundsException with subflows while removing listener from RuleFlowEventSupport
> -----------------------------------------------------------------------------------------
>
>                 Key: JBRULES-1770
>                 URL: https://jira.jboss.org/browse/JBRULES-1770
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core (flow)
>    Affects Versions: 4.0.7
>         Environment: MyEclipse Blue, Windows XP, 
>            Reporter: Richard bedard
>            Assignee: Kris Verlaenen
>             Fix For: 5.2.0.M1
>
>
> I have 9 ruleFlows, A, B and C  and 6 others
> A is the main one that include B as a subflow and 6 others, B include C as a subflow
> When RuleFlowEventSupport.fireRuleFlowProcessCompleted is called, the listeners list contains 8 elements, 1 per sub ruleflow.
> The size of the list is set in a variable "size" for performance i guess:
> for ( int i = 0, size = this.listeners.size(); i < size; i++ ) {
> But somehow, i didn't check the reason, the method removeEventListener is called and the list size is now 7, so im
> having an java.lang.IndexOutOfBoundsException.
> This appen when the subflow C isn't changing the working memory(no insert, modify or remove), when an object is inserted, 
> there is no error... I've tried with and without shadow fact "setShadowProxy( false/true );"
> Object removed:
> listener	RuleFlowProcessInstanceImpl  (id=7454)	
> 	id		2	
> 	nodeInstances	ArrayList<E>  (id=7749)	
> 	process		RuleFlowProcessImpl  (id=7750)	
> 	state		2	
> 	workingMemory	ReteooStatefulSession  (id=7444)	
> Stack that show the object removing while iterating on the list:
> RuleFlowEventSupport.removeEventListener(RuleFlowEventListener) line: 48	<----- A listener is removed here
> ReteooStatefulSession(AbstractWorkingMemory).removeEventListener(RuleFlowEventListener) line: 306	
> RuleFlowProcessInstanceImpl.setState(int) line: 184	
> EndNodeInstanceImpl.trigger(RuleFlowNodeInstance) line: 30	
> RuleFlowJoinInstanceImpl.triggerCompleted() line: 89	
> RuleFlowJoinInstanceImpl.checkActivation() line: 85	
> RuleFlowJoinInstanceImpl.trigger(RuleFlowNodeInstance) line: 59	
> SubFlowNodeInstanceImpl.triggerCompleted() line: 51	
> RuleFlowProcessInstanceImpl.ruleFlowCompleted(RuleFlowCompletedEvent, WorkingMemory) line: 262	
> RuleFlowEventSupport.fireRuleFlowProcessCompleted(RuleFlowProcessInstance, InternalWorkingMemory) line: 86	<--- Iterating on the listeners list here
> RuleFlowProcessInstanceImpl.setState(int) line: 185	
> EndNodeInstanceImpl.trigger(RuleFlowNodeInstance) line: 30	
> RuleFlowJoinInstanceImpl.triggerCompleted() line: 89	
> RuleFlowJoinInstanceImpl.checkActivation() line: 85	
> RuleFlowJoinInstanceImpl.trigger(RuleFlowNodeInstance) line: 59	
> RuleFlowGroupImpl(RuleFlowSequenceNodeInstanceImpl).triggerCompleted() line: 38	
> RuleFlowGroupImpl.setActive(boolean) line: 103	
> RuleFlowGroupImpl$DeactivateCallback.execute(InternalWorkingMemory) line: 211	
> ReteooStatefulSession(AbstractWorkingMemory).executeQueuedActions() line: 1312	
> ReteooStatefulSession(AbstractWorkingMemory).fireAllRules(AgendaFilter, int) line: 467	
> ReteooStatefulSession(AbstractWorkingMemory).fireAllRules() line: 439	
> DroolsStdImpl.executeRulesEngine(List<Object>, String) line: 100	
> UPDATE:
> When i remove the subflow C from the ruleflow B, and move the 2 ruleFlowGroup from C to B, there is no error.

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