‘Starting Tomcat v9.0 Server at localhost’ has encountered a problem
在 Eclipse 配置 JavaWeb 开发环境，某次运行 tomcat 服务器出现了此错误。
根本原因：此问题必然是配置错误导致的，配置的 servlet 资源路径重复，需将其区别开来。
（笔者是把 @WebFilter 写成了 @WebServlet 所以被检查 servlet 资源路径重复，导致此错误。）
共勉！
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