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

（1）原因：web项目需要在web服务器（Apache）和web应用服务器（Tomcat）上运行，没把项目部署到Tomcat中
（2）转载链接：http://blog.****.net/testcs_dn/article/details/36455669#comments

完整错误信息：

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Description Resource Path Location Type
The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path add.jsp /dwz-Java/WebContent/WEB-INF/jsp/management/news line 1 JSP Problem

解决办法如下：
出现此错误后在错误项目上右击 Bulid Path—> Configure Build Path…—>

然后按照下图顺序步骤：