Re: [rules-users] New in Drools, java.lang.NullPointerException at org.drools.reteoo.AccumulateNode.getFirstMatch(AccumulateNode.java:967)

Hi Wofgang: Thank youvery much for your response. I was replaying to Mauricio when your email has arrived. I hope the test case is useful.

Best regards, Manuel Ortiz. 2011/3/31 Wolfgang Laun <wolfgang.laun(a)gmail.com&gt; > Manuel, > > I have reported this (or a very similar) problem > https://issues.jboss.org/browse/JBRULES-2887 with a small example to > reproduce. > > The stack trace is not identical, so please try to reproduce this with a > small test case; it is bound to happen with a rule (Test Negativo Alarma > Acceso Portal Ubicacion UM) that modifies some fact that is used in an > "accumulate" phrase, (If this pattern is different from the one I gave, I'll > raise the issue priority to "critical".) > > Cheers > Wolfgang > > > 2011/3/30 Manuel Ortiz <manuel.ortizramos(a)gmail.com&gt; > >> Hello all! >> >> I am new in Drools but day by day, test by test, I think I get a bit more >> knowledge of how the rule engine works from user point of view. I've been >> adding rules to an alarm system, increasing the complexity and functionality >> in several steps. Unfortunately in the last step I found the following >> NullPointerException inside the rule engine... >> >> java.lang.NullPointerException >> at >> org.drools.reteoo.AccumulateNode.getFirstMatch(AccumulateNode.java:967) >> at >> org.drools.reteoo.AccumulateNode.modifyLeftTuple(AccumulateNode.java:329) >> at >> org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyChildLeftTuple(SingleLeftTupleSinkAdapter.java:239) >> at >> org.drools.reteoo.AccumulateNode.evaluateResultConstraints(AccumulateNode.java:640) >> at >> org.drools.reteoo.AccumulateNode.assertObject(AccumulateNode.java:270) >> at org.drools.reteoo.BetaNode.modifyObject(BetaNode.java:312) >> at >> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:460) >> at >> org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:428) >> at org.drools.reteoo.AlphaNode.modifyObject(AlphaNode.java:160) >> at >> org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:460) >> at >> org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:428) >> at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:263) >> at >> org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:172) >> at >> org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1442) >> at >> org.drools.common.AbstractWorkingMemory.update(AbstractWorkingMemory.java:1349) >> at >> org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:183) >> at >> org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:196) >> at >> es.simcasva.alarmas.rules.Rule_Test_Negativo_Alarma_Acceso_Portal_Ubicacion_UM_0.defaultConsequence(Rule_Test_Negativo_Alarma_Acceso_Portal_Ubicacion_UM_0.java:18) >> at >> es.simcasva.alarmas.rules.Rule_Test_Negativo_Alarma_Acceso_Portal_Ubicacion_UM_0DefaultConsequenceInvoker.evaluate(Rule_Test_Negativo_Alarma_Acceso_Portal_Ubicacion_UM_0DefaultConsequenceInvoker.java:44) >> at >> org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:917) >> at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:856) >> at >> org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1071) >> at >> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:785) >> at >> org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:751) >> at >> org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218) >> >> I've been trying to find the problem, and found a strange interaction >> between three rules that makes the null pointer to appear. The alarm system >> has many rules now and it is difficult to simplify the scenario, so I just >> would like to know what is the funcion of AccumulateNode object in order to >> have an idea of the NullPointerException possible cause. >> >> Can anyone help me? >> >> Thank you in advance for your time. >> >> Regards, >> >> Manuel Ortiz. >> >> >> _______________________________________________ >> rules-users mailing list >> rules-users(a)lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users >> >> > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users