@Entity
@Table(name = "USER")
@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id", scope = User.class)
public class User extends AbstractValueObject {
    private Integer id;
    private String name;
 .....
}

public class Load extends AbstractValueObject {
    private Integer id;
    private User postedBy;
}

[
  {
   "id" : 1,
   "postedBy" : {
                  "id":1,
                  "name":"SOF"
                }
  },
  {
   "id" : 1,
   "postedBy" : 1
  }
]