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I have the following class: public class Car implements Comparable<Car>{ private long idCar; private String model; private String immat; //Car License Plate private Company company; private Manufacturer manufacturer; private Calendar registrationDate; private Calendar lastControlDate; //Has empty constructor + Getters and setters here onwards... and it's hibernate configuration file: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="Car" table="cars" lazy="true"> <id name="idCar" type="long" column="idCar"> <generator class="native" /> </id> <property name="model" type="string" column="model" /> <property name="immat" type="string" column="immat" /> <property name="registrationDate" type="date" column="registrationDate" /> <property name="lastControlDate" type="date" column="lastControlDate" /> <many-to-one name="company" class="fr.model.company.Company" column="idCompany" not-null="true" /> <many-to-one name="manufacturer" class="fr.model.component.Manufacturer" column="idManufacturer" not-null="true" /> </class> </hibernate-mapping> and the Manufacturer class: public class Manufacturer implements Comparable<Manufacturer> { private Long idManufacturer; private String name; I keep getting the association unmapped references error but I can't figure out why so far. Edit: Manufacturer mapping - <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hib

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