[jboss-jira] [JBoss JIRA] (DROOLS-3413) CME in DefaultAgenda.evaluateEagerList

[Will Keaney (Jira)]

Will Keaney created DROOLS-3413:
-----------------------------------

             Summary: CME in DefaultAgenda.evaluateEagerList
                 Key: DROOLS-3413
                 URL: https://issues.jboss.org/browse/DROOLS-3413
             Project: Drools
          Issue Type: Bug
          Components: core engine
    Affects Versions: 6.5.0.Final
         Environment: RHEL 6.10 x86_64
Drools embedded in OpenNMS Meridian 2017.1.5.
            Reporter: Will Keaney
            Assignee: Mario Fusco


I have a KieSession that runs in Stream processing mode, which is throwing frequent ConcurrentModificationExceptions in evaluateEagerList:
{code}Exception in thread "FireTask" java.util.ConcurrentModificationException
    at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
    at java.util.ArrayList$Itr.next(ArrayList.java:851)
    at org.drools.core.phreak.PhreakFromNode.doLeftUpdates(PhreakFromNode.java:176)
    at org.drools.core.phreak.PhreakFromNode.doNode(PhreakFromNode.java:64)
    at org.drools.core.phreak.RuleNetworkEvaluator.evalNode(RuleNetworkEvaluator.java:355)
    at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:301)
    at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:136)
    at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:94)
    at org.drools.core.phreak.RuleExecutor.evaluateNetwork(RuleExecutor.java:65)
    at org.drools.core.common.DefaultAgenda.evaluateEagerList(DefaultAgenda.java:983)
    at org.drools.core.phreak.RuleExecutor.haltRuleFiring(RuleExecutor.java:233)
    at org.drools.core.phreak.RuleExecutor.fire(RuleExecutor.java:138)
    at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:74)
    at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:970)
    at org.drools.core.common.DefaultAgenda.fireLoop(DefaultAgenda.java:1312)
    at org.drools.core.common.DefaultAgenda.fireUntilHalt(DefaultAgenda.java:1232)
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:1398)
    at org.drools.core.impl.StatefulKnowledgeSessionImpl.fireUntilHalt(StatefulKnowledgeSessionImpl.java:1377)
    at org.opennms.netmgt.correlation.drools.DroolsCorrelationEngine.lambda$initialize$2(DroolsCorrelationEngine.java:217)
    at java.lang.Thread.run(Thread.java:745){code}
Many of the rules in this KB have {{no-loop true}}.



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