Hibernate双向映射，保存子进程不更新父进程

Question

第一个断言语句通过但第二个断言未通过。逐步执行代码，数据库在每次提交时都会正确更新。但是，当辅助实体对象更新时，主实体似乎不会更新。

Entity secondary = (Entity) session.get(Entity.class, 2);            
secondary.setPrimary(null); 
session.beginTransaction();
session.save(secondary);
session.getTransaction().commit();

Entity primary = (Entity) session.get(Entity.class, 1);
secondary.setPrimary(primary);
session.beginTransaction();            
session.save(secondary);
session.getTransaction().commit();

Set<Entity> secondarySet;

// If I comment out these two lines, the next assert passes.
secondarySet = primary.getSecondarySet();
assertFalse(secondarySet.isEmpty());

secondary.setPrimary(null);       
session.beginTransaction();            
session.save(secondary);
session.getTransaction().commit();

primary = (Entity) session.get(Entity.class, 1);
secondarySet = primary.getSecondarySet();
assertTrue(secondarySet.isEmpty());

我尝试了一些不成功的解决方案，例如将CascadeType.All添加到@OneToMany注释中，并刷新会话。一旦我的辅助实体保存并更改数据库，如何更新我的主要实体？

我的实体类看起来像：

@Entity
@DynamicInsert
@DynamicUpdate
@Table(catalog = "catalog", name = "Entity")
public class Entity implements java.io.Serializable {

    private int id; 
    private Entity primary;
    private Set<Entity> secondarySet;

    public Entity() {
    }

    @Id
    @Column(name = "ID_", unique = true, nullable = false)
    public int getId() {
        return this.id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @OneToMany(mappedBy = "primary")
    public Set<Entity> getSecondarySet() {
        return this.secondarySet;
    }

    public void setSecondarySet(Set<Entity> secondarySet) {
        this.secondarySet = secondarySet;
    }

    /**
     * @return primary client if it exists, otherwise null
     */
    @ManyToOne(cascade = CascadeType.ALL)
    @NotFound(action = NotFoundAction.IGNORE) // can be it's own primary
    @JoinTable(catalog = "catalog", name="entitylink",
          joinColumns = {@JoinColumn(name="secondaryid_")},
          inverseJoinColumns = {@JoinColumn(name="primaryid_")})    
    public Entity getPrimary() {
        return this.primary;
    }

    public void setPrimary(Entity primary) {
        this.primary = primary;
    }
}