[rules-users] object parameter object

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' 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.