1、根据文档检查发现并没有安装Tomcat，然后准备在Eclipse中安装Tomcat.
JSP报错：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path
2、Eclipse中集成Tomcat，安装好以后，在菜单栏依旧没有猫咪。于是又准备去进行第三步，安装Tomcat插件。
http://www.cnblogs.com/leiOOlei/p/3372258.html
3、Eclipse中Tomcat插件集成到工具栏
http://james23dier.iteye.com/blog/612358
JSP报错：The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path
原文：http://www.cnblogs.com/liuyp-ken/p/5500138.html