[rules-dev] ConcurrentModificationException thrown from EntryPointNode.updateSink

Using Drools 5.0.1 FINAL Our logs contain the following exception: java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:2117) at java.util.HashMap$ValueIterator.next(HashMap.java:2147) at org.drools.reteoo.EntryPointNode.updateSink(EntryPointNode.java:285) at org.drools.reteoo.ObjectTypeNode.attach(ObjectTypeNode.java:279) at org.drools.reteoo.builder.PatternBuilder.attachObjectTypeNode(PatternBuilder.java:234) at org.drools.reteoo.ClassObjectTypeConf.<init>(ClassObjectTypeConf.java:93) at org.drools.common.ObjectTypeConfigurationRegistry.getObjectTypeConf(ObjectTypeConfigurationRegistry.java:58) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:849) at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788) at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:216) at com.wellsfargo.ARGenT.Execution.SimXmlDataLoader.Load(SimXmlDataLoader.java:713) The code fragment around line 285 of EntryPointNode.java is the following: Could the nested call to assertObject be causing the ConcurrentModificationException? In other words, could the call to sink.assertObject cause an eventual recursive entry into updateSink or call another method that changes the registry and effectively invalidates the objectTypeConf iterator? public void updateSink(final ObjectSink sink, final PropagationContext context, final InternalWorkingMemory workingMemory) { // @todo // JBRULES-612: the cache MUST be invalidated when a new node type is added to the network, so iterate and reset all caches. final ObjectTypeNode node = (ObjectTypeNode) sink; final ObjectType newObjectType = node.getObjectType(); InternalWorkingMemoryEntryPoint wmEntryPoint = (InternalWorkingMemoryEntryPoint) workingMemory.getWorkingMemoryEntryPoint( this.entryPoint.getEntryPointId() ); LINE 285: for ( ObjectTypeConf objectTypeConf : wmEntryPoint.getObjectTypeConfigurationRegistry().values() ) { if ( newObjectType.isAssignableFrom( objectTypeConf.getConcreteObjectTypeNode().getObjectType() ) ) { objectTypeConf.resetCache(); ObjectTypeNode sourceNode = objectTypeConf.getConcreteObjectTypeNode(); Iterator it = ((ObjectHashSet) workingMemory.getNodeMemory( sourceNode )).iterator(); for ( ObjectEntry entry = (ObjectEntry) it.next(); entry != null; entry = (ObjectEntry) it.next() ) { sink.assertObject( (InternalFactHandle) entry.getValue(), context, workingMemory ); } } } } Tom Murphy Business Process Consultant Wells Fargo HCFG - CORE Deal Decisioning Platform 800 S. Jordan Creek Parkway | West Des Moines, IA 50266 MAC: X2301-01B Office: 515 324 4853 | Mobile: 941 320 8014 This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation.