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-boun...@lists.jboss.org
[mailto:rules-users-boun...@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
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