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Код

public interface Car {
    public Long getRecordId();
    public void setRecordId(Long recordId);
    
    public Model getModel();
    public void setModel(Model model);
}

public interface Model {
    public Long getRecordId();
    public void setRecordId(Long recordId);
    public String getName();
    public void setName(String name);
}

public CarManager {
    public Car getCar(Long id);
    public void removeCar(Long id);
    public void removeCar(Car car);
    public Model getModel(Long id);
    public void removeModel(Long id);
    public void removeModel(Model car);
}

//////////////////////////////////////////////////////////

public class MemoryCar implements Car {
    private Model model;

    public Long getRecordId() { return null; }
    public void setRecordId(Long recordId) {}
    
    public Model getModel() { return model; }
    public void setModel(Model model) {this.model = model;}
}

public class MemoryModel implements Model {
    private String name;

    public Long getRecordId() { return null; }
    public void setRecordId(Long recordId) {}
    
    public Name getName() { return name; }
    public void setName(String name) {this.name = name;}
}

public MemoryCarManager implements CarManager {

    private HashSet<Long, Car> cars = new HashSet<Long, Car>();
    private HashSet<Long, Model> models = new HashSet<Long, Model>();

    public Car getCar(Long id) {
        return cars.get(id);
    }
    public void removeCar(Long id) {
        cars.removeKey(id);
    }
    public void removeCar(Car car) {
        cars.remove(car);
    }
    public Model getModel(Long id) {
         return models.get(id);
    }
    public void removeModel(Long id) {
        models.removeKey(id);
    }
    public void removeModel(Model car) {
        models.remove(car);
    }
}

///////////////////////////////////////////////////////////////////////////
@Entity
public class JpaCar implements Car {
    @Id
    @GenerateValue
    private Long recordId;

   @ManyToOne
   private Model model;
    public JpaCar() {
        
    }
    public JpaCar(Long recordId) {
        setRecordId(recordId);
    }

    public Long getRecordId() { return recordId; }
    public void setRecordId(Long recordId) {this.recordId = recordId}
    
    public Model getModel() { return model; }
    public void setModel(Model model) {this.model = model;}
}

public class JpaModel implements Model {
    @Id
    @GenerateValue
    private Long recordId;

   private String name;

    public Long getRecordId() { return recordId; }
    public void setRecordId(Long recordId) {this.recordId = recordId}
    
    public String getName() { return name; }
    public void setName(String name) {this.name = name;}

}

public class JpaCarManager implements CarManager {

    private SessionFactory factory;

    public JpaCarManager(SessionFactory factory) {
        this.factory = factory;
    }

    public Car getCar(Long id) {
        return (Car)factory.createSession().get(JpaCar.class, id);
    }
    public void removeCar(Long id) {
        removeCar(new JpaCar(id));
    }
    public void removeCar(Car car) {
         Session s = factory.createSesson();
         s.startTransaction();
         s.delete(car);
         s.getTransaction().commit();
    }
    public Model getModel(Long id) {
         return (Model)factory.createSession().get(JpaModel.class, id);
    }
    public void removeModel(Long id);
    public void removeModel(Model model) {
         Session s = factory.createSesson();
         s.startTransaction();
         s.delete(model);
         s.getTransaction().commit();
    }
}