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

问题描述：eclipse中建立一个动态网站项目，添加测试页index.jsp时出现错误：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

解决方法：Adding the tomcat server in the server runtime will do the job :Project Properties-> Java Build Path-> Add Library -> Select "Server Runtime" from the list-> Next->Select "Apache Tomcat"-> Finish.