Java – JPA: @ embeddable object how to get a reference to its owner?

I have a user class, @ embedded a profile class How to give an instance of a profile a user class reference to its owner?

@Entity
class User implements Serializable  {
   @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Integer id;

   @Embedded Profile profile;

   // .. other properties ..
}

@Embeddable
class Profile implements Serializable {

   User user; // how to make this work?

   setURL(String url) {
      if (user.active() ) { // for this kind of usage
         // do something
      }
   }

   // .. other properties ..
}

Solution

Assuming JPA instead of strict hibernate, you can implement @ embedded by applying @ embedded to getter / setter pairs instead of private members themselves

@Entity
class User implements Serializable {
   @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Integer id;

   @Access(AccessType.PROPERTY)
   @Embedded
   private Profile profile;

   public Profile getProfile() {
      return profile;
   }

   public void setProfile(Profile profile) {
      this.profile = profile;
      this.profile.setUser(this);
   }

   // ...
}

However, in this case, I will question whether the embedded entity is what you want, not the @ onetoone relationship, or simply put the "profile" class into the "user"@ The main reason for embeddable is code reuse, which seems unlikely in this case