Springboot啟動報錯：Caused by: org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean

今天碰到這個錯，真的頭痛，讓人哭笑不得

springboot啟動報錯：

Caused by: org.springframework.context.ApplicationContextException: Unable to start ServletWebServerApplicationContext due to missing ServletWebServerFactory bean.
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.getWebServerFactory(ServletWebServerApplicationContext.java:206) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:180) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:154) ~[spring-boot-2.1.4.RELEASE.jar:2.1.4.RELEASE]

最后解決：

SpringApplication.run方法第一個參數傳錯了：錯：SpringApplication.class ，換成：StartBootTestApplication.class。引以為戒 

@SpringBootApplication
@EnableAsync
public class StartBootTestApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringApplication.class,args);
    }
}