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

[Richard bedard (JIRA)]

IndexOutOfBoundsException with subflows while removing listener from RuleFlowEventSupport
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                 Key: JBRULES-1770
                 URL: https://jira.jboss.org/jira/browse/JBRULES-1770
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Rule Flow
    Affects Versions: 4.0.7
         Environment: MyEclipse Blue, Windows XP, 
            Reporter: Richard bedard
            Assignee: Mark Proctor


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 "i" 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 listerner 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	


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