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

IndexOutOfBoundsException with subflows while removing listener from RuleFlowEventSupport ----------------------------------------------------------------------------------------- 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: drools-core (flow) Affects Versions: 4.0.7 Environment: MyEclipse Blue, Windows XP, Reporter: Richard bedard Assignee: Kris Verlaenen Fix For: 4.0.8 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.