[jboss-jira] [JBoss JIRA] Created: (JBRULES-2418) Drools Session insert ConcurrentModificationException in Multithreading Enviroment

[Davide Carnevali (JIRA)]

Drools Session insert ConcurrentModificationException in Multithreading Enviroment
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                 Key: JBRULES-2418
                 URL: https://jira.jboss.org/jira/browse/JBRULES-2418
             Project: Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: drools-core
    Affects Versions: 5.0.1.FINAL
         Environment: Aix on Websphere 6.1 - IBM Java 5
            Reporter: Davide Carnevali
            Assignee: Mark Proctor
            Priority: Critical


In multithreading enviroment (with 50 active thread) sometimes occurs a ConcurrentModificationException , the complete stacktrace

Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:1091)
	at java.util.HashMap$ValueIterator.next(HashMap.java:1122)
	at org.drools.reteoo.ClassObjectTypeConf.getMatchingObjectTypes(ClassObjectTypeConf.java:171)
	at org.drools.reteoo.ClassObjectTypeConf.getObjectTypeNodes(ClassObjectTypeConf.java:163)
	at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:143)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1046)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:1001)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)
	at it.vtfinance.vtpie.mlp.bpm.conditions.DroolsCondition.passesCondition(DroolsCondition.java:52)
	at com.opensymphony.workflow.AbstractWorkflow.passesCondition(AbstractWorkflow.java:904)
	... 24 more


DroolsCondition is SINGLETONE, all thread use a same RuleBase but creates a new Session for each Thread.



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