Springboot 为什么下面这段代码会报这个错

@RestController
@RequestMapping("/users")
public class UserController {
    @Autowired
    private UserRepository userRepository;
    @GetMapping
    public ModelAndView list(Model model){
            System.out.println("this is list");
          model.addAttribute("userList", userRepository.getAllUser());
          model.addAttribute("title", "用户列表");
          return new ModelAndView("users/list","userModel",model);
      }
        }

其中list是一个html

String类型转换成Long类型错误，getAllUser()返回值对了？