[J2EE]The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path · J2EE

~~~ The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path ~~~ - description：新建jsp页面出现小红叉错误警示. ![这里写图片描述](https://box.kancloud.cn/2016-02-26_56cfbdd7351ea.jpg "") - solution 原因是没有加入tomcat运行类. web工程->右键build path->configure build path->libraries->add library->server runtime->apache tomcat vX.0