Код-ревью: сервис уведомлений

@Service
public class NotificationService {

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private ReportService reportService;

    private EmailClient emailClient = new EmailClient("smtp.example.com", 25);

    private static NotificationService instance;

    @Autowired
    public void init() {
        instance = this;
    }

    public static NotificationService get() {
        return instance;
    }

    public void notifyAll(String text) {
        for (User u : userRepository.findAll()) {
            emailClient.send(u.getEmail(), text);
        }
        reportService.markNotified();
    }
}