Several ports (8005, 8080, 8009) required by Tomcat v9.0 Server at localhost are already in use.解决方法

Several ports (8005, 8080, 8009) required by Tomcat v9.0 Server at localhost are already in use. The server may already be running in another process, or a system process may be using the port. To start this server you will need to stop the other process or change the port number(s).

解决方法：window——Show views——Servers——右键tomacat关闭，然后重新运行项目