休眠 - 双向@OneToOne(Hibernate - bidirectional @OneToOne)

 我有2个类：User和UserPicture，它们具有1：1的关系。 
 
public class User {
     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     @Column(name="id", nullable = false, unique = true)
 private int id;

     private String firstname;

     private String lastname;

     @OneToOne
     @JoinColumn(name = "picture") //field named "picture" in the database
     private UserPicture userPicture;

     ..
}


public class UserPicture {

     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     @Column(name="id", nullable = false, unique = true)
     private int id;

     private Blob image;

     @OneToOne
     @JoinColumn(name = "user")
     User user;
 
 UserPicture中的'user'将被加载，但user'user'中的'userPicture'不是 - 我做错了什么？ 
 
 编辑不得不添加，我只是创建一个UserPicture并插入它们（与现有的用户ID） - 也许我需要在UserPicture中级联'用户'？ 

I have 2 classes: User and UserPicture which have a 1:1 relationship.
 
public class User {
     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     @Column(name="id", nullable = false, unique = true)
 private int id;

     private String firstname;

     private String lastname;

     @OneToOne
     @JoinColumn(name = "picture") //field named "picture" in the database
     private UserPicture userPicture;

     ..
}


public class UserPicture {

     @Id
     @GeneratedValue(strategy=GenerationType.AUTO)
     @Column(name="id", nullable = false, unique = true)
     private int id;

     private Blob image;

     @OneToOne
     @JoinColumn(name = "user")
     User user;
 
'user' in UserPicture will be loaded but 'userPicture' in User not - what did Im wrong?
 
EDIT Have to add that Im just create a UserPicture and insert them (with existing userId) - maybe I need to cascade 'user' in UserPicture?

原文：https://stackoverflow.com/questions/13044567