[Trouble shooting] tomcat error : Port 8080 required by Tomcat v8.5 Server at localhost is already in use

eclipse 서버 실행 중 다음과 같은 에러창 발생

Port 8080 required by Tomcat v8.5 Server at localhost is 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).

해결 : https://lasbe.tistory.com/70