Dentro de um controller:

    @Autowired
    private UserRepository userRepository;

    @Autowired
    public ApplicationContext context;

    @GetMapping("/users")
    public List<User> getUser(){

        return userRepository.findAll();
    }

    @GetMapping("/gambiarra")
    public List<User> test(){

        return ((UserController) context.getBean("userController")).getUser();
    }