运行程序报错
提示如下：The method getContextPath() from the type HttpServletRequest refers to the missing type
解决方法：
1 右击该项目 - Build Path - Configure Build Path ， 在 Libraries 选项下，会发现有个出错的jre Libraries，将其Remove掉。
2 然后右击该项目 - Build Path - Add Library， 选择JRE System Library，选择Workspace defaulr JRE(jdk1.6)(此前JDK已成功安装并配置好)， 然后 Finish 。
参考文章：http://blog.csdn.net/home_zhang/article/details/8548560
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