@Entity
@Table
class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @Column
    private Integer value;

    @OneToOne(cascade = CascadeType.ALL, orphanRemoval = true, mappedBy = "user")
    private UserDetails userDetails = new UserDetails(this);

    // getters, setters

}

@Entity
@Table(name = "user_details")
class UserDetails {

    @GenericGenerator(name = "generator", strategy = "foreign",
         parameters = @Parameter(name = "property", value = "user"))
    @Id
    @GeneratedValue(generator = "generator")
    @Column(name = "user_id", unique = true, nullable = false)
    private Integer id;

    @Column
    private String name;

    @OneToOne
    @PrimaryKeyJoinColumn
    private User user;

    public UserDetails(User user) {
        setUser(user);
    }

    //getters, setters

}

public interface UserRepository extends JpaRepository<User, Integer> {

    @Transactional
    @Modifying
    @Query("update User set value = ?2 where userDetails.name = ?1")
    Integer addValue(String name, int value);

}

@OneToOne(cascade = CascadeType.ALL, orphanRemoval = true)
private UserDetails userDetails = new UserDetails(this);

@OneToOne(mappedBy = "userDetails")
@PrimaryKeyJoinColumn
private User user;