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
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