java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:841)
at java.util.HashMap$ValueIterator.next(HashMap.java:871)
at org.drools.reteoo.EntryPointNode.updateSink(EntryPointNode.java:319)
at org.drools.reteoo.ObjectTypeNode.attach(ObjectTypeNode.java:304)
at org.drools.reteoo.builder.PatternBuilder.attachObjectTypeNode(PatternBuilder.java:254)
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:981)
at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:917)
at org.drools.integrationtests.MultithreadTest$RulebaseRunner.run(MultithreadTest.java:149)
at java.lang.Thread.run(Thread.java:595)