[rules-users] nested accessors with Sets

[mark.mcnally at comcast.net]

Hello,

Please excuse me if I have double posted - my first did not seem to appear.

I am wondering if the following is valid rule syntax. I am getting  a stacktrace when the rules fire that points to a ClassCastException on a HashSet

I am using v4.0 GA. 

Thank you, Mark


rule StateMatch
	when
	$ca:CandidateAssociation(nurseDetails.stateLicensures excludes patientDetails.state  )			
	then 	
		retract( $ca );
end


public class CandidateAssociation {
	private PatientDetails patientDetails;
	private NurseDetails   nurseDetails;
	private int overlapHours;

	public CandidateAssociation( PatientDetails patientDetails, NurseDetails nurseDetails) {
		super();
		this.patientDetails = patientDetails;
		this.nurseDetails = nurseDetails;
		overlapHours = participantDetails.getNumberOverlapHourCnt(nurseDetails);
	}
[...]
}

public class NurseDetails {
	private Set stateLicensures = new HashSet();
	[...]
}
public class PatientDetails {
	private String state;
	[...]
}

------------------------------------------------------
Firing Rules 
**********
org.drools.RuntimeDroolsException: Exception executing predicate org.drools.base.mvel.MVELPredicateExpression at 27d6bfb
	at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:197)
	at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:121)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:317)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:159)
	at org.drools.reteoo.Rete.assertObject(Rete.java:175)
	at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
	at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:772)
	at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:64)
	at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:58)
	at org.drools.examples.Rule_InitializeCandidateForEachNurse_0.consequence(Rule_InitializeCandidateForEachNurse_0.java:13)
	at org.drools.examples.Rule_InitializeCandidateForEachNurse_0ConsequenceInvoker.evaluate(Rule_InitializeCandidateForEachNurse_0ConsequenceInvoker.java:25)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:503)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:467)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:403)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:384)
	at primarynursePOC.PrimaryNursePOC.selectPrimaryNurse(PrimaryNursePOC.java:136)
	at primarynursePOC.PrimaryNursePOC.main(PrimaryNursePOC.java:91)
Caused by: java.lang.ClassCastException: java.util.HashSet
	at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:35)
	at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:191)
	... 17 more
org.drools.RuntimeDroolsException: Exception executing predicate org.drools.base.mvel.MVELPredicateExpression at 27d6bfb
	at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:197)
	at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:121)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:317)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:159)
	at org.drools.reteoo.Rete.assertObject(Rete.java:175)
	at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
	at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:772)
	at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:64)
	at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:58)
	at org.drools.examples.Rule_InitializeCandidateForEachNurse_0.consequence(Rule_InitializeCandidateForEachNurse_0.java:13)
	at org.drools.examples.Rule_InitializeCandidateForEachNurse_0ConsequenceInvoker.evaluate(Rule_InitializeCandidateForEachNurse_0ConsequenceInvoker.java:25)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:503)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:467)
	at org.drools.common.AbstractWorkingMemory.doOtherwise(AbstractWorkingMemory.java:430)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:412)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:384)
	at primarynursePOC.PrimaryNursePOC.selectPrimaryNurse(PrimaryNursePOC.java:136)
	at primarynursePOC.PrimaryNursePOC.main(PrimaryNursePOC.java:91)
Caused by: java.lang.ClassCastException: java.util.HashSet
	at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:35)
	at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:191)
	... 18 more
Exception in thread "main" org.drools.spi.ConsequenceException: org.drools.RuntimeDroolsException: Exception executing predicate org.drools.base.mvel.MVELPredicateExpression at 27d6bfb
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:507)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:467)
	at org.drools.common.AbstractWorkingMemory.doOtherwise(AbstractWorkingMemory.java:430)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:412)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:384)
	at primarynursePOC.PrimaryNursePOC.selectPrimaryNurse(PrimaryNursePOC.java:136)
	at primarynursePOC.PrimaryNursePOC.main(PrimaryNursePOC.java:91)
Caused by: org.drools.RuntimeDroolsException: Exception executing predicate org.drools.base.mvel.MVELPredicateExpression at 27d6bfb
	at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:197)
	at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:121)
	at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:317)
	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:159)
	at org.drools.reteoo.Rete.assertObject(Rete.java:175)
	at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)
	at org.drools.reteoo.ReteooWorkingMemory.doInsert(ReteooWorkingMemory.java:70)
	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:772)
	at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:64)
	at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:58)
	at org.drools.examples.Rule_InitializeCandidateForEachNurse_0.consequence(Rule_InitializeCandidateForEachNurse_0.java:13)
	at org.drools.examples.Rule_InitializeCandidateForEachNurse_0ConsequenceInvoker.evaluate(Rule_InitializeCandidateForEachNurse_0ConsequenceInvoker.java:25)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:503)
	... 6 more
Caused by: java.lang.ClassCastException: java.util.HashSet
	at org.drools.base.mvel.MVELPredicateExpression.evaluate(MVELPredicateExpression.java:35)
	at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:191)
	... 18 more