org.springframework.context.ApplicationContextException: Unable to start web server; nested exceptio

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org.springframework.context.ApplicationContextException: Unable to start web server; nested exception is org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.

使用maven搭建Springboot项目时报如上错误。搜了好多方案，都没有解决错误。

希望下面方案能帮到你。。。

@Controller
public class HelloController {

    @RequestMapping("/Hello")
    @ResponseBody
    public Map<String,Object> showHello(){
        Map retMap=new HashMap<String,Object>();
        retMap.put("msg", "使用maven构建的SpringBoot项目");
        return retMap;
    }
}

@SpringBootApplication
public class App {

    public static void main(String[] args) {
        SpringApplication.run(HelloController.class,args);
    }
}

原因以及解决方案：App启动类中 

SpringApplication.run(HelloController.class,args);

改为

SpringApplication.run(App.class,args);

注意启动类的输入参数。