Maurice –

By design of our runtime components, a single stateful session is owned and managed by a single thread. Data is only inserted by that one thread into that session.

Unless maybe the Web Logic app server is doing something odd under the covers…

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: 515 423 4334

tom.e.murphy@wellsfargo.com

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From: rules-dev-bounces@lists.jboss.org [mailto:rules-dev-bounces@lists.jboss.org] On Behalf Of Mauricio Salatino
Sent: Tuesday, June 22, 2010 8:26 AM
To: Rules Dev List
Subject: Re: [rules-dev] Exception in runtime

Are you inserting facts from different threads in a statefull session?

On Tue, Jun 22, 2010 at 10:21 AM, <Tom.E.Murphy@wellsfargo.com> wrote:

Anybody have any ideas on this?

We are seeing ConcurrentModificationException while inserting objects into working memory. This happens occasionally, either at service start-up, where the first transaction is being submitted and the rules are loading for the first time, or sometimes under heavy loads with lots of transactions being processed by the service:

Drools 5.0.1-GA

AS: Web Logic

JVM: 1.5

Fragment of stack trace:

Caused by: java.util.ConcurrentModificationException

java.util.HashMap$HashIterator.nextEntry(HashMap.java:2117)

java.util.HashMap$ValueIterator.next(HashMap.java:2147)

org.drools.reteoo.EntryPointNode.updateSink(EntryPointNode.java:285)

org.drools.reteoo.ObjectTypeNode.attach(ObjectTypeNode.java:279)

org.drools.reteoo.builder.PatternBuilder.attachObjectTypeNode(PatternBuilder.java:234)

org.drools.reteoo.ClassObjectTypeConf.<init>(ClassObjectTypeConf.java:93)

org.drools.common.ObjectTypeConfigurationRegistry.getObjectTypeConf(ObjectTypeConfigurationRegistry.java:58)

org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:849)

org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:788)

org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:216)

com.wellsfargo.ARGenT.Execution.DefaultLoader.Load(DefaultLoader.java:16)

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