[JSP] Eclipse 開發 JSP 遇到 The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path

裝好了JDK, JRE, Tomcat, Eclipse, MySQL後
開JSP專案遇到了
The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path
Error

對 Project 右鍵 Properties

Add a runtime first and select project properties then check server name from 'Runtimes' tab as shown in image.

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