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

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JSP页面顶端出现“红色”的报错信息：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path。原来Javaweb工程类中没有添加Tomcat运行时相关类导致。
下面是具体的解决方法：
1、右击web工程-》属性或Build Path-》Java Build Path->Libraries-> Add Libray...->Server Runtime -》Tomcat Server
2、切换到Java Build Path界面中的Orader and Export，选择Tomcat。

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

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原文地址：http://www.cnblogs.com/goAhead-hust/p/4509480.html