<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>

@GetMapping
    public ModelAndView showCheckList() {
        String text = "тестовый текст";
        System.out.println(text);
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("test",text);
        modelAndView.setViewName("shop/CheckList");
        return modelAndView;
    }