一段时间没用eclipse后，再去打开以前的项目，发现一打开前线标红。查看错误的时候，如下图所示：

Error:The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

原来是“在Java构建路径上没有找到超'javax servlet .http.httpservlet'”

所以直接在原来报错的①项目右键>>Build Path>>Configure Build Path,进行项目的配置生成路径。如图：

②Add Library---->>Server Runtime (配置要运行的服务器)

酱紫，就完成了项目部署了你要运行的服务器！但还没有解决问题！

你还得需要③部署JRE(Java Runtime Environment)运行环境和一些相关的lib.。。。最后Apply and Close就行了。如图：

这样就解决了那些红彤彤的Error!

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