Unable to start web server; nested exception is org.springframework.context.ApplicationContextException

Unable to start web server; nested exception is org.springframework.context.ApplicationContextException是由于缺少ServletWebServerFactory bean引起的。这个问题通常是因为在启动类中没有正确配置注解导致的。解决方法是在启动类之前添加@EnableAutoConfiguration注解。同时，确保Controller类已经正确配置了@Controller注解，并且在主程序中使用@SpringBootApplication注解进行配置。下面是一个修正后的示例代码：

@EnableAutoConfiguration
@Controller
public class HelloController {
    @ResponseBody
    @RequestMapping("/hello")
    public String hello(){
        return "hello SpringBoot!";
    }
}

主程序：

@SpringBootApplication
public class HelloApplication {
    public static void main(String[] args) throws Exception {
        SpringApplication.run(HelloController.class, args);
    }
}

这样，应该就能够解决Unable to start web server的问题了。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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