Bean名称“电话簿”的BindingResult和普通目标对象都不能用作请求属性

Question

我试图在电话号码输入中添加验证，但在访问索引时却坚持解决此错误。

错误讯息

由以下原因引起：org.attoparser.ParseException：执行处理器org.thymeleaf.spring5.processor.SpringInputGeneralFieldTagProcessor时出错（模板：“索引”-第76行，第73行）

由以下原因引起：java.lang.IllegalStateException：Bean名称“ phonenumber”的BindingResult和普通目标对象都不能用作请求属性

控制器

@RequestMapping(value = {"/"}, method = RequestMethod.GET)

public String showPage(Model model, @RequestParam(defaultValue = "0") int page) {

    model.addAttribute("data", phonebookRepository.findAll(PageRequest.of(page, 10)));

    model.addAttribute("currentPage", page);

    return "index";

}

@PostMapping("/save")

public String save(@Valid Phonebook p, BindingResult bindingResult) {

    if (bindingResult.hasErrors()) {

        return "redirect:/";

    }else {

        phonebookRepository.save(p);

    }

    return "redirect:/";

}

电话簿

     @Entity

        @Table(name = "Phonebook")

        public class Phonebook {

            @Id

            @GeneratedValue(strategy = GenerationType.AUTO)

            @Column(name = "id")

            private Integer id;

            @NotNull

            @Size(max=15, message = "Max symbols is 15")

            @Column(name = "phonenumber", length = 15, nullable = false)

            private String phonenumber;

            @Column(name = "surname", length = 50, nullable = false)

            private String surname;

            @Column(name = "firstname", length = 50, nullable = false)

            private String firstname;

//getters and setter