Dirk, The problem seems not related to shadow facts, but to constraint resolution and fact data extraction. It might be a bug or not... need more info. In any case, the offending rule is not the one you showed. The offending rule contains a double beta constraint in a join:
org.drools.common. > > DoubleBetaConstraints.isAllowedCachedRight(DoubleBetaConstraints.java:164) > at org.drools.reteoo.JoinNode.retractObject(JoinNode.java:189) Can you narrow it down? Did you tried with Drools 5.0.1? []s Edson 2009/6/24 Dirk Bergstrom <d...@juniper.net> > I'm running into an NPE using Drools 4.0.7, and I'm stumped by it > (stacktrace > below). I made some changes to seemingly unrelated code, and this error > started > showing up. It would help me to understand what's going on if someone > could > tell me roughly what's going on here. Since the error is thrown by > generated > code (in what I assume is a shadow proxy), I can't tell what the offending > null > pointer is. I'm not even entirely sure what's triggering the bug (it > happens > half an hour into the run of big multi-threaded application with about 40K > objects in the working memory). > > Is this happening because: > > *) getRli_nums() in one of my PRRecord objects is returning a null value? > > *) There is a null PRRecord object backing the shadow proxy? > > *) Some other thing is null? > > *) I'm running into a bug in Drools? > > I stuck in this rule: > > when > $pr : PRRecord( rli_nums == null ) > then > System.out.println($pr.getId()); > end > > And it didn't print anything, so I'm inclined to think that this is not a > simple > matter of something returning a null value... > > I'll be most appreciative of any help I can get. > > Here's the stacktrace: > > java.lang.NullPointerException > at > > org.drools.base.net.juniper.dash.data.PRRecord13409648$getRli_nums.getValue(Unknown > Source) > at > org.drools.base.ClassFieldExtractor.getValue(ClassFieldExtractor.java:127) > at > > org.drools.base.evaluators.BaseMemberOfEvaluator.evaluateCachedRight(BaseMemberOfEvaluator.java:45) > at > > org.drools.rule.VariableRestriction.isAllowedCachedRight(VariableRestriction.java:89) > at > > org.drools.rule.VariableConstraint.isAllowedCachedRight(VariableConstraint.java:81) > at > > org.drools.common.DoubleBetaConstraints.isAllowedCachedRight(DoubleBetaConstraints.java:164) > at org.drools.reteoo.JoinNode.retractObject(JoinNode.java:189) > at > > org.drools.reteoo.CompositeObjectSinkAdapter.propagateRetractObject(CompositeObjectSinkAdapter.java:375) > at > org.drools.reteoo.ObjectTypeNode.retractObject(ObjectTypeNode.java:189) > at org.drools.reteoo.Rete.retractObject(Rete.java:215) > at > org.drools.reteoo.ReteooRuleBase.retractObject(ReteooRuleBase.java:211) > at > > org.drools.reteoo.ReteooWorkingMemory.doRetract(ReteooWorkingMemory.java:79) > at > > org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1250) > at > > org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1203) > at > > net.juniper.dash.data.DataSource.reconcileAssertedRecords(DataSource.java:409) > > -- > Dirk Bergstrom d...@juniper.net > _____________________________________________ > Juniper Networks Inc., Computer Geek > Tel: 408.745.3182 Fax: 408.745.8905 > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com
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