Eclipse Change workspace appears in the superclass "Javax.servlet.http.HttpServlet" is not found on the Java----issue "

The first step: that is because the project does not tell it which Tomcat to run, right-click the project name-----"Build path--" Configure path---->library------>add Library-------"Server Runtime-----" Add a Tomcat

For details, please refer to http://jingyan.baidu.com/article/f79b7cb34f40569144023ef9.html

The second step: if there is no option in the server Runtme, you can find the server---"Running environment in Windows, the specific content can be seen http://blog.csdn.net/xyy511/article/details/46457665

Eclipse Change workspace appears in the superclass "Javax.servlet.http.HttpServlet" is not found on the Java----issue "