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

Wednesday, 2 December 2009

when using 'or' the bindings and the object types for those bindings 
must balance for each logical outcome.

Mark
Shah, Malay wrote:
...
 Thanks W.

 I removed the binding of EtsExecutionOrderXref_core00, and it looked 
 good. But I am getting ClassCastException when adding new facts and 
 conditions. I now have a new fact (EtsExecutionHist_core0) and an eval 
 statement to check if the rule has already been fired for a unique key 
 that is determined by variables in EtsExecutionHist_core0 fact.

 Exception in thread "main" org.drools.RuntimeDroolsException: 
 !(violations.containsKey("S-50_EtsExecutionHist_core" + "_entityOID_"

 + EtsExecutionHist_core0_entityOID
 + "_entityVID_" + EtsExecutionHist_core0_entityVID
 )) : *[Error: com.ms.ieddata.etsdb.model.EtsExecutionOrderHist_core 
 cannot be cast to com.ms.ieddata.etsdb.model.EtsExecutionHist_core]
 *
 When I don't have the eval statement, the rule works perfectly well. 
 Also, I checked that if I flip the order of defining facts in the rule 
 (i.e. having EtsExecutionHist_core0 fact before 
 EtsExecutionOrderHist_core0), the rule works fine.

 Below is the drool code and the error:

 *Drool Rule:*

 package S_50

 import com.ms.ieddata.dataQuality.violation.Violation;
 import com.ms.ieddata.etsdb.model.EtsExecutionOrderHist_core;
 import com.ms.ieddata.etsdb.model.EtsExecutionHist_core;
 import com.ms.ieddata.etsdb.model.EtsExecutionOrderXref_core;
 global java.util.HashMap violations;
 dialect "mvel"
 rule "Legacy ETSDB Rule"
 when
         EtsExecutionOrderHist_core0:EtsExecutionOrderHist_core
         (
             customerOrFirm != "0"
         )
         EtsExecutionHist_core0:EtsExecutionHist_core
         (
             parentOID == EtsExecutionOrderHist_core0.entityOID,
             lastCapacity == "1",
             application != "MMETL",
 *            EtsExecutionHist_core0_entityOID:entityOID,
             EtsExecutionHist_core0_entityVID:entityVID*
         )
         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"
                 )
             )
 *eval(!(violations.containsKey("S-50_EtsExecutionHist_core" + 
 "_entityOID_" + EtsExecutionHist_core0_entityOID + "_entityVID_" + 
 EtsExecutionHist_core0_entityVID)))*
 then
     System.out.println("Rule Fired");
 end

 *Exception:*

 Exception in thread "main" org.drools.RuntimeDroolsException: 
 !(violations.containsKey("S-50_EtsExecutionHist_core" + "_entityOID_"

 + EtsExecutionHist_core0_entityOID
 + "_entityVID_" + EtsExecutionHist_core0_entityVID
 )) : *[Error: com.ms.ieddata.etsdb.model.EtsExecutionOrderHist_core 
 cannot be cast to com.ms.ieddata.etsdb.model.EtsExecutionHist_core]
 *[Near : {... Unknown ....}]
              ^
 [Line: 1, Column: 0]
  at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:122)
  at 
 org.drools.reteoo.EvalConditionNode.assertLeftTuple(EvalConditionNode.java:180)
  at 

org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)
  at 

org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:34)
  at org.drools.reteoo.NotNode.assertLeftTuple(NotNode.java:123)
  at 

org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:145)
  at 

org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateAssertLeftTuple(CompositeLeftTupleSinkAdapter.java:39)
  at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:116)
  at 

org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:117)
  at 

org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:78)
  at 
 org.drools.reteoo.LIANodePropagation.doPropagation(LIANodePropagation.java:47)
  at 
 org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:649)
  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: [Error: 
 com.ms.ieddata.etsdb.model.EtsExecutionOrderHist_core cannot be cast 
 to com.ms.ieddata.etsdb.model.EtsExecutionHist_core]
 [Near : {... Unknown ....}]
              ^
 [Line: 1, Column: 0]
  at 

org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:388)
  at 

org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:138)
  at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:133)
  at 
 org.mvel2.ast.BinaryOperation.getReducedValueAccelerated(BinaryOperation.java:102)
  at 
 org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
  at 

org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:833)
  at 

org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:315)
  at 

org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:138)
  at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:133)
  at 
 org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
  at 
 org.mvel2.ast.Substatement.getReducedValueAccelerated(Substatement.java:40)
  at 
 org.mvel2.compiler.ExecutableAccessor.getValue(ExecutableAccessor.java:37)
  at org.mvel2.ast.Negation.getReducedValueAccelerated(Negation.java:44)
  at org.mvel2.MVELRuntime.execute(MVELRuntime.java:85)
  at 
 org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:104)
  at org.mvel2.MVEL.executeExpression(MVEL.java:978)
  at 
 org.drools.base.mvel.MVELEvalExpression.evaluate(MVELEvalExpression.java:83)
  at org.drools.rule.EvalCondition.isAllowed(EvalCondition.java:117)
  ... 18 more
 Caused by: java.lang.ClassCastException: 
 com.ms.ieddata.etsdb.model.EtsExecutionOrderHist_core cannot be cast 
 to com.ms.ieddata.etsdb.model.EtsExecutionHist_core
  at 

org.drools.base.com.ms.ieddata.etsdb.model.EtsExecutionHist_core32580467$getEntityVID.getValue(Unknown

 Source)
  at org.drools.base.ClassFieldReader.getValue(ClassFieldReader.java:91)
  at org.drools.rule.Declaration.getValue(Declaration.java:244)
  at 

org.drools.base.mvel.DroolsMVELPreviousDeclarationVariable.getValue(DroolsMVELPreviousDeclarationVariable.java:67)
  at 

org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getBeanProperty(ReflectiveAccessorOptimizer.java:446)
  at 

org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:312)
  ... 35 more

 Am I missing something here? I think this is a perfectly valid rule, 
 where eval statement is needed to make sure we don't fire the rule 
 multiple times. I don't have the entire consequence section in the 
 drool code above, but we perform multiple actions if rules are fired. 
 I am trying to get to the bottom of this, because we generate these 
 Drool Rule Code on the fly, and I can't determine the order in which 
 facts (and their variables) would be defined.

 Any kind of help here would be much appreciated.

 Thanks

 Malay Shah

 ------------------------------------------------------------------------
 *From:* rules-users-bounces(a)lists.jboss.org 
 [mailto:rules-users-bounces@lists.jboss.org] *On Behalf Of *Wolfgang Laun
 *Sent:* Wednesday, December 02, 2009 1:47 AM
 *To:* Rules Users List
 *Subject:* Re: [rules-users] Drool Rule Error with "or not" condition

 Binding a variable to a fact in a branch of an 'or' (as you are doing 
 with EtsExecutionOrderXref_core00) is not useful, since you cannot use 
 this binding in the consequence. (The rule might just as well fire due 
 to the 2nd term (the "or not...") being true, and then the variable 
 would not be bound, causing NPE.

 If you do need this binding to access the fact in the consequence, you 
 should splt the rule.

 -W

 2009/12/2 Shah, Malay <Malay.Shah(a)morganstanley.com 
 <mailto:Malay.Shah@morganstanley.com>>

     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@lists.jboss.org>
     [mailto:rules-users-bounces@lists.jboss.org
     <mailto:rules-users-bounces@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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Re: [rules-users] Drool Rule Error with "or not" condition