【日期】：2020/4/7
【问题】：续上次修改端口后（Idea运行Spring项目报错 “Web server failed to start. Port 8080 was already in use.”（一）），重启后，又发现新的错误。
APPLICATION FAILED TO START
Description:
Web server failed to start. Port 8080 was already in use.
Action:
Identify and stop the process that’s listening on port 8080 or configure this application to listen on another port.
Process finished with exit code 0
新的错误
【原因】：tomcat 9.0服务自动启动
【如何发现】：偶然发现，理性分析
【如何修复】：关闭tomcat服务自动启动就好了. （如何关闭（启动）自动启动的tomcat进程）
