@Entity
@Table(name = "USERLOGIN")
public class UserLogin implements UserDetails {

  private static final long serialVersionUID = 1L;

  @Id
  @GeneratedValue(strategy=GenerationType.IDENTITY)
  @Column(name = "id")
  private Integer id;

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

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

  @OneToOne(mappedBy = "userlogin")
  private User user;

  public User getUser() {
    return user;
  }

  public void setUser(User user) {
    this.user = user;

**Other getters and setters**

}

@Entity
@Table(name = "USER")
public class User implements Serializable {

  private static final long serialVersionUID = 1L;

  @Id
  @GeneratedValue
  private Integer id;

  @Column(name = "meal")
  private Integer meal;

  @OneToOne
  @JoinColumn(name = "userlogin_id")
  private UserLogin userlogin;

  public UserLogin getUserLogin() {
    return userlogin;
  }

  public void setUserLogin(UserLogin userLogin) {
    this.userlogin = userLogin;
    userLogin.setUser(this);

**Other getters and setters**

}

@Service
public class AddUserServiceImpl implements AddUserService{

  @Autowired
  private UserRepository userRepository;

  @Autowired
  private CurrentUserService currentUserService;

  public void saveUser(User userDAO) {

    User user = new User();
    user.setMeal(userDAO.getMeal());
    user.setUserLogin(currentUserService.getCurrentUser());

    userRepository.save(user);

  }

}

@Repository
public interface UserRepository extends JpaRepository<User, Integer>{

}

@Service
public class CurrentUserServiceImpl implements CurrentUserService {

  @Autowired
  UserLoginRepository userLoginRepository;

  public String getCurrentUsername() {
    return SecurityContextHolder.getContext().getAuthentication().getName();
  }

  public UserLogin getCurrentUser() {
    return userLoginRepository.findByUserName(getCurrentUsername());
  }

}


@Repository
public interface UserLoginRepository extends JpaRepository<UserLogin,
Integer> {

   @Query("select u from UserLogin u where u.username=:username")
   UserLogin findByUserName( @Param("username") String username);

}