nested accessors with Sets - "not contains" is not a valid operator for MVEL ---------------------------------------------------------------------------- Key: JBRULES-1058 URL: https://issues.jboss.org/browse/JBRULES-1058 Project: JBRULES Issue Type: Bug Components: drools-compiler Affects Versions: 4.0.0.GA Reporter: Mark McNally Assignee: Edson Tirelli Fix For: 4.0.1 Following does not work: 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; [...] } Edson suggested that the problem is that "not contains" is not a valid operator for MVEL. Also Noticed that the following workaround did not work: rule State dialect "mvel" when $ca:CandidateAssociation( eval ( ! nurseDetails.stateLicensures.contains( patientDetails.state ) ) ) then retract( $ca ); end This produced this Exception: org.drools.rule.InvalidRulePackage: Unable to determine the used declarations : [Rule name=State, agendaGroup=MAIN, salience=0, no-loop=false] at org.drools.rule.Package.checkValidity(Package.java:408) at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:288) at [...]