The method getContextPath() from the type HttpServletRequest refers to the missing type
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这种问题主要是以下两种情况：
1.jar包问题。解决方法：project右键Properties---java build path下remove掉有问题的jar包，一般都是jre的jar包有问题，然后add library导入正确的jar包（如果原来没有设置jer，则可以在Window-Preferences-Java-Installed JRES增加对应的jre包）。
2.编码格式没有对应，如果页面设置的pageEncoding为“UTF-8”，则设置项目编码格式都为UTF-8（project右键Properties--Resource下Other选择UTF-8）。
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- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- The method getContextPath() from the type HttpServletRequest refers to the missing type
- the method getcontextpath（） from the type httpservletrequest refers to the missing type string
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