Spring 错误There was an unexpected error (type=Internal Server Error, status=500)解决方法

package com.example.demo.controller;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * Created by lixiaofei on 2019/10/18.
 */
@Controller

public class HelloController {

    @GetMapping("/hello")
    public String hello(@RequestParam(name = "name") String name, Model model){
        model.addAttribute("name",name);
        return "hello";
    }
}

出现错误如下：

Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing this as a fallback.

Sat Oct 19 01:52:14 CST 2019
There was an unexpected error (type=Internal Server Error, status=500).
Circular view path [hello]: would dispatch back to the current handler URL [/hello] again. 
Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to 
default view name generation.)

解决方案是在@GetMapping下面加上一行@ResponseBody即可。