javax.servlet.jsp.PageContext cannot be resolved

下载shopxx后开始build工作，出现：

The project was not built since its build path is incomplete. Cannot find the class file for javax.servlet.jsp.PageContext .  Fix the build path then try building this project 
The type  javax.servlet.jsp.PageContext  cannot be resolved. It is indirectly referenced from required .class
 files 的错误。

把servlet-api.jar和jsp-api.jar包加入libraries中即可。

转自：http://blog.chinaunix.net/uid-20681545-id-3412158.html