The Tomcat server configuration at /Servers/Tomcat v9.0 Server at localhost-config is missing. Check
mac版eclipse报错The Tomcat server configuration at /Servers/Tomcat v9.0 Server at localhost-config is missing. Check the server for errors.解决方法：
点击左上角eclipse-Preferences-Server-runtime environments
选择版本，我这选择的是9.0，顺便勾选上create a new local server ，然后finsih
然后本地就有server了