为什么hibernate会忽略我的更新？

Question

我创建了抽象通用的@MappedSuperclass。这适用于select，insert查询。但是hibernate不会生成更新查询。我不明白泛型课有什么问题。

@MappedSuperclass
@Cacheable
public abstract class Category<T extends Category> {

  private Integer id;

  private String name;

  private T parent;

  private List<T> children;

  @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
  public Integer getId() {
    return id;
  }
  //omitted 
}

@Entity
@Table(name = "staticPageCategory")
public class StaticPageCategory extends Category<StaticPageCategory> implements Serializable {

  @ManyToOne
  @Override
  public StaticPageCategory getParent() {
    return super.getParent();
  }

  @OrderBy("ordering asc, name asc")
  @OneToMany(mappedBy = "parent")
  @Override
  public List<StaticPageCategory> getChildren() {
    return super.getChildren();
  }
}

问题是为什么hibernate忽略了getCurrentSession（）。update（myCategory）;