Re: [rules-users] LHS compare two lists

Hi, I'm trying to determine if a user has the required certifications for a position. So I'm comparing the list of required certifications to the list of User Certifications but I'm throwing a nullPointerException even though I check to make sure the list are not null on their respective objects. How do I iterate between both list? rule "Determine if the user has the required certifications" dialect 'mvel' no-loop true salience 80 when $user : User() $profile : UserProfile($userCertifications : userCertifications, eval(userCertifications != null)) from $user.userProfile $position : Position($certifications : requiredCertifications, eval(requiredCertifications != null)) exists ($certification: Certification() from $certifications and UserCertification(certification == $certification) from $userCertifications) then System.out.println("The user has the required certifications"); end public UserProfile { List<UserCertification> userCertifications; //more fields } public Position { List<Certification> requiredCertifications; //more fields } public Certification { Long id; String name; //more fields } public UserCertification { Long id; Date certificationDate; Certification certification; //more fields } -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/LHS-compare-two-lists... Sent from the Drools - User mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users