Org.hibernate.WrongClassException

I am working on a figure skating project. I have a Person class and three subclasses: Skater, Coach and Choreographer.

@Entity
@Inheritance(strategy = InheritanceType.JOINED)
public class Person {
    private String idPerson;
    private String name;
    private String sex;
    private Calendar birthday;
    private String info;
... getters and setters
}

@Entity
@PrimaryKeyJoinColumn(name="id_skater")
public class Skater extends Person {
    private List<Result> resultsByIdSkater;
    private List<SkaterCoach> skaterCoachesByIdSkater;
    private List<SkaterCountry> skaterCountriesByIdSkater;
    private List<SkaterChoreographer> skaterChoreographersByIdSkater;
...getters and setters

      

        
        
        
      

    

The coach and the choreographer are similar. It is obvious that a real person can simultaneously be a coach, choreographer and skater. I want to do something like this:

    CoachDao coachDao=new CoachDaoImpl();
    ChoreographerDao choreographerDao=new ChoreographerDaoImpl();
    Coach coach= (Coach) coachDao.findByName("SERHII VAYPAN").get(0);
    Choreographer choreographer= (Choreographer) choreographerDao.findByName("SERHII VAYPAN").get(0);

      

        
        
        
      

    

But I

org.hibernate.WrongClassException: Object [id=980ae71847e343f9a15755625456bf40] was not of the specified subclass [ru.fsinfo.entity.Coach] : loaded object was of wrong class class ru.fsinfo.entity.Choreographer

      

        
        
        
      

    

I understand that I can do this in different sessions. But for some reason I want to do it in one session. Is it possible?