Drools Session insert ConcurrentModificationException in Multithreading Enviroment ---------------------------------------------------------------------------------- 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. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: https://jira.jboss.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira