[rules-users] Object parameter

Hello, First sorry for my bad english I have a problem when I execute this code rule "userrole" when user1: BnUserValue(name : name, creationDate : creationDate) and ActiviteOut : BnNodeValue( BnRole: BnRole ) and lien: BnEdgeValue(id : id) then System.out.println("oui ça marche"); end BnRole is attribut type ; BnRoleValue (class declared) when I remote this attribue(BnRole) this code work all the attribut which I set with type different to classique type (String, Integer, Date, List,... ) implique an error execution I don't know why I import all my class and I'm sure that class haven't error the error is the error is org.drools.rule.InvalidRulePackage: Unable to create Field Extractor for 'BnRole' class BnRolevalue et Bn Value is in the joint piece please help me it's very urgent thank you for your help Best regards Ismail --------------------------------- Découvrez une nouvelle façon d'obtenir des réponses à toutes vos questions ! Profitez des connaissances, des opinions et des expériences des internautes sur Yahoo! Questions/Réponses.