[rules-users] Null Pointer Exception with 10K+ kBase objects

[Davide Sottara]

Could you post the full test case (rules + java)?
Thanks
Davide

On 01/28/2014 05:10 PM, jhusby wrote:
> I'm trying to stress-test Drools to see what its limits are, and I stumbled
> across a NPE when I have a large amount of facts in a stateful
> knowledgebase:
>
> java.lang.NullPointerException
> 	at
> org.drools.core.phreak.PhreakTimerNode.doPropagateChildLeftTuple(PhreakTimerNode.java:355)
> 	at
> org.drools.core.phreak.PhreakTimerNode.doPropagateChildLeftTuples(PhreakTimerNode.java:325)
> 	at org.drools.core.phreak.PhreakTimerNode.doNode(PhreakTimerNode.java:72)
> 	at
> org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:357)
> 	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:200)
> 	at
> org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:67)
> 	at
> org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:935)
> 	at
> org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1200)
> 	at
> org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:957)
> 	at
> org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:931)
> 	at
> org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:256)
>
> I have a little program that creates, populates, fires, and destroys a
> session repeatedly.  With 10K objects in the knowledge base, I get the NPE
> the first time I loop through my program, but not subsequently (probably
> because by the subsequent executions things have been cached).  With 100K
> objects, I get the exception most times.  With 1M objects, I get the NPE
> every time.
>
> Am I doing anything wrong or is it simply taking so long to execute all the
> rules that something times out?  Is there a timeout param I could set?
>
> Thank you!
>
> Joseph
>
>
>
> --
> View this message in context: http://drools.46999.n3.nabble.com/Null-Pointer-Exception-with-10K-kBase-objects-tp4027887.html
> Sent from the Drools: User forum mailing list archive at Nabble.com.
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>