Several ports (8005, 8080, 8009) required by Tomcat v8.5 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).
原因：这是由于之前已经打开了Tomcat，而运行eclipse时会执行再次打开Tomcat的操作。
解决方法：到Tomcat的安装目录（D:\安装包\apache-tomcat-8.5.24\bin（我的安装目录））中双击shutdown.bat关闭Tomcat后再在eclipse中运行。
原文：https://www.cnblogs.com/lwpblogs/p/9164968.html