org.hibernate.WrongClassException

Question

我正在做一个关于花样滑冰的项目。 我有一个Person类和三个子类：Skater，Coach和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

教练和舞蹈指导是相似的。 很明显，真正的人可以同时担任教练，舞蹈指导和滑板运动员。 我想做这样的事情：

    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);

但我有

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

我知道我可以在不同的会话中完成。但出于某种原因，我想在一个会话中做到这一点。有可能吗？