Hibernate：org.hibernate.WrongClassException

Question

由于以下问题，我正在敲打头：

我有2个实体clases继承基类。基类只存储创建/更新日期。

基类：

@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
public abstract class BaseEntity {

@Id
@GeneratedValue(strategy = GenerationType.TABLE)
@Column(name = "id")
private int id;

@Temporal(TemporalType.TIMESTAMP)
@Column(name = "CREATED", nullable = true)
private Date created;

@PrePersist
protected void onCreate() {
    created = new Date();
}

...

子类1：

@Entity
@Table(name = "hotel")
@XmlRootElement
public class Hotel extends BaseEntity implements Serializable
...
@OneToMany(fetch = FetchType.EAGER, mappedBy = "hotel", cascade = CascadeType.ALL, orphanRemoval = true)
private Set<HotelManager> hotelManagers = new HashSet<HotelManager>();
...

子类2：

@Entity
@Table(name = "hotel_manager")
public class HotelManager extends BaseEntity implements Serializable {

...
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "hotel_id", nullable = false)
private Hotel hotel;
....

每当我尝试加载酒店实体时，我都会收到以下错误：

org.hibernate.WrongClassException：id为7的对象不是指定的子类：de.hop.entity.HotelManager（加载的对象是类错误的类de.hop.entity.Hotel）

附注：偶然酒店行id（唯一ID）以及hotelmanager行id在两个db表中都是'7'

任何想法???

Answer 1

您可以将@ MappedSuperclass代替@Inheritance添加到基类。