[JBoss JIRA] (DROOLS-634) Exception thrown from WorkingMemoryLogger randomly when simultaneous evaluation taking place by different threads
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[
https://issues.jboss.org/browse/DROOLS-634?page=com.atlassian.jira.plugin...
]
Anantjot Anand commented on DROOLS-634:
---------------------------------------
In my case, we were providing the runtime model+rules to another team who was
incorporating jars in to their flow. I believed they had flaw in their singleton approach
when loading rulebase. The webservices environment bring this type of issue to forefront
when one thread is still loading rulebase and building link lists and other data
structures for managing rule network and a separate thread comes along prematurely to do
the evaluation.
I added a null pointer check at the point of exception and asked them to double check
their singleton approach. They came back that my fix resolved this but I believe fixing
the singleton had solved the issue for them.
Exception thrown from WorkingMemoryLogger randomly when simultaneous
evaluation taking place by different threads
-----------------------------------------------------------------------------------------------------------------
Key: DROOLS-634
URL: https://issues.jboss.org/browse/DROOLS-634
Project: Drools
Issue Type: Bug
Affects Versions: 6.2.0.CR1
Reporter: Anantjot Anand
Assignee: Mario Fusco
Caused by: java.lang.NullPointerException
at
org.drools.core.reteoo.RuleTerminalNodeLeftTuple.getDeclarationIds(RuleTerminalNodeLeftTuple.java:394)
at
org.drools.core.audit.WorkingMemoryLogger.extractDeclarations(WorkingMemoryLogger.java:325)
at org.drools.core.audit.WorkingMemoryLogger.matchCreated(WorkingMemoryLogger.java:269)
at
org.drools.core.event.AgendaEventSupport.fireActivationCreated(AgendaEventSupport.java:58)
at
org.drools.core.phreak.PhreakRuleTerminalNode.doLeftTupleInsert(PhreakRuleTerminalNode.java:95)
at
org.drools.core.phreak.PhreakRuleTerminalNode.doLeftInserts(PhreakRuleTerminalNode.java:69)
at org.drools.core.phreak.PhreakRuleTerminalNode.doNode(PhreakRuleTerminalNode.java:42)
at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:316)
at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
at
org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:225)
at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:98)
at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:988)
at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1274)
at
org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1281)
at
org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:1254)
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Anantjot Anand (JIRA)