Eclipse: The superclass “javax.servlet.http.HttpServlet” was not found on the Java Build Path

Link:

http://stackoverflow.com/questions/22756153/the-superclass-javax-servlet-http-httpservlet-was-not-found-on-the-java-build

解决方法：

1)  选中出错的project，

2)   Project->Properties->Target Runtimes->The used web server( e.g. Apache Tomcat)