关于 下面问题是因为(8005, 8080, 8009) 被原tomcat占用了。
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).
在使用eclipse新创建tomcat时server也使用了(8005, 8080, 8009)，因此运行项目会报告以上错误。
解决方案简单粗暴，把新创建的server的端口都修改了。找到空间下的server.xml(E:\eclipse-workspace\Servers\Tomcat v9.0 Server at localhost-config\server.xml),查找到8005, 8080, 8009改成自己想的端口。也可以eclipse里修改，在如下图8005, 8080为8006，8081，8009没有截图出来，大家可以按ctrl+f5查找。改完后，运行就不会再报以上的错误了。
Java tomcat Several ports (8005, 8080, 8009) required by Tomcat v9.0 Server at localhost
原文：https://www.cnblogs.com/lizhenhong/p/10344872.html