Re: [rules-users] Drool Rule Error with "or not" condition

Thanks Mark. I removed the binding and the rule is compiled now, but while firing the rule over set of objects, I get a Null pointer exception. Here is the updated Drool rule: dialect "mvel" rule "Legacy ETSDB Rule" when EtsExecutionOrderHist_core0:EtsExecutionOrderHist_core(customerOrFirm != "0") EtsExecutionOrderXref_core00:EtsExecutionOrderXref_core ( entityOID == EtsExecutionOrderHist_core0.entityOID, entityRID == EtsExecutionOrderHist_core0.entityRID, entityVID == EtsExecutionOrderHist_core0.entityVID, referenceID != "2" && referenceIDType == "orderSubCapacity" ) or not(EtsExecutionOrderXref_core ( entityOID == EtsExecutionOrderHist_core0.entityOID, entityRID == EtsExecutionOrderHist_core0.entityRID, entityVID == EtsExecutionOrderHist_core0.entityVID, referenceIDType == "orderSubCapacity" ) ) then System.out.println("Rule fired"); end and here is the stack trace: Exception in thread "main" org.drools.runtime.rule.ConsequenceException: java.lang.NullPointerException at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:23) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:943) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:885) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1086) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:660) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:637) at org.drools.reteoo.ReteooStatelessSession.execute(ReteooStatelessSession.java:203) at com.ms.ruleutils.RuleProcessor.process(RuleProcessor.java:142) at com.ms.ruleutils.RuleProcessor.process(RuleProcessor.java:73) at com.ms.ieddata.dataQuality.dqWithRR.DQCommandLineMain.performDQ(DQCommandLineMain.java:291) at com.ms.ieddata.dataQuality.dqWithRR.DQCommandLineMain.runEngine(DQCommandLineMain.java:196) at com.ms.ieddata.dataQuality.dqWithRR.DQCommandLineMain.main(DQCommandLineMain.java:170) Caused by: java.lang.NullPointerException at org.drools.base.mvel.DroolsMVELFactory.getTupleObjectFor(DroolsMVELFactory.java:182) at org.drools.base.mvel.DroolsMVELFactory.setContext(DroolsMVELFactory.java:176) at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:57) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:934) ... 10 more After debugging through, DroolMVELFactory class object is looking for Declaration definition for "EtsExecutionOrderXref_core00", not finding it, and hence giving a null pointer exception. I am using Drools 5.0.1. Any idea about why this would happen? Does the rule seem right now? Thanks Malay Shah ------------------------------ *From:* rules-users-bounces(a)lists.jboss.org [mailto: rules-users-bounces(a)lists.jboss.org] *On Behalf Of *Mark Proctor *Sent:* Tuesday, December 01, 2009 6:56 PM *To:* Rules Users List *Subject:* Re: [rules-users] Drool Rule Error with "or not" condition You are binding the result of the 'or' to EtsExecutionOrderXref_core00 as the second part is a 'not' which returns nothing, how would it be bound to? Shah, Malay wrote: Hi All, I have the following drool rule that has "or not" under Entity Block. Basically, the rule tries to check if there either exists an entity object EtsExecutionOrderXref_core00 with the given conditions, or the entity does not exist at all with some other conditions. dialect "mvel" rule "Legacy ETSDB Rule" when EtsExecutionOrderHist_core0:EtsExecutionOrderHist_core(customerOrFirm != "0") EtsExecutionOrderXref_core00: ( EtsExecutionOrderXref_core ( entityOID == EtsExecutionOrderHist_core0.entityOID , entityRID == EtsExecutionOrderHist_core0.entityRID , entityVID == EtsExecutionOrderHist_core0.entityVID , referenceID != "2" && referenceIDType == "orderSubCapacity" ) or not(EtsExecutionOrderXref_core ( entityOID == EtsExecutionOrderHist_core0.entityOID , entityRID == EtsExecutionOrderHist_core0.entityRID , entityVID == EtsExecutionOrderHist_core0.entityVID , referenceIDType == "orderSubCapacity" )) ) then end But, while compiling the rule, I am getting the following errors: org.drools.compiler.DroolsParserException: [ERR 101] Line 22:16 no viable alternative at input 'entityOID' in rule "Legacy ETSDB Rule" in pattern not, org.drools.compiler.DroolsParserException: [ERR 102] Line 22:68 mismatched input ',' expecting '(' in rule "Legacy ETSDB Rule" in pattern EtsExecutionOrderHist_core0.entityOID, org.drools.compiler.DroolsParserException: [ERR 102] Line 22:122 mismatched input ',' expecting '(' in rule "Legacy ETSDB Rule" in pattern EtsExecutionOrderHist_core0.entityOID in pattern EtsExecutionOrderHist_core0.entityRID, org.drools.compiler.DroolsParserException: [ERR 102] Line 22:176 mismatched input ',' expecting '(' in rule "Legacy ETSDB Rule" in pattern EtsExecutionOrderHist_core0.entityOID in pattern EtsExecutionOrderHist_core0.entityRID in pattern EtsExecutionOrderHist_core0.entityVID] I think the rule is correct, but am not able to figure out these compilation errors. Could anybody please comment on why this would happen? Thanks Malay Shah ------------------------------ NOTICE: If received in error, please destroy, and notify sender. Sender does not intend to waive confidentiality or privilege. Use of this email is prohibited when received in error. We may monitor and store emails to the extent permitted by applicable law. ------------------------------ _______________________________________________ rules-users mailing listrules-users@lists.jboss.orghttps://lists.jboss.org/mailman/listinfo/rules-users ------------------------------ NOTICE: If received in error, please destroy, and notify sender. Sender does not intend to waive confidentiality or privilege. Use of this email is prohibited when received in error. We may monitor and store emails to the extent permitted by applicable law. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users