WEB-INF/lib下最好不要有jsp-api,servlet-api 包
报如下错误
exception javax.servlet.ServletException: org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 28 in the generated java fileThe method getJspApplicationContext(ServletContext) is undefined for the type JspFactory
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找了好久，发现是web-inf/lib下的jsp-api,servlet-api与tomcat/lib下的包重复，删除就好了。
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特别是用MVN管理的工程一定要注意。
