com.stackoverflow.questions.21787875.java

@Entity
@Table(name = "User")
public class User {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Integer id;

    @Column(name = "uuid")
    private String uuid;

    @OneToOne
    @JoinColumn(name = "uuid", referencedColumnName = "frn_object_uuid")
    private Foo foo;

    @OneToOne(mappedBy = "user")
    private Bar bar;

    // getters and setters
}

@Entity
@Table(name = "Foo")
public class Foo {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Integer id;

    @Column(name = "frn_object_uuid")
    private String objectUuid;

    @Column(name = "foo")
    private String foo;

    // getters and setters
}

@Entity
@Table(name = "Bar")
public class Bar {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id")
    private Integer id;

    @Column(name = "frn_user_id")
    private Integer userId;
    
    @Column(name = "bar")
    private String bar;

    @OneToOne
    @JoinColumn(name = "frn_user_id")
    private User user;

    // getters and setters
}