org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.runtime.E
一、服务器：tomcat 7.0.39。需要无项目名、80端口访问在conf\server.xml中配置端口为80
<Connector port="80" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
在
<Host name="localhost"appBase="webapps"
unpackWARs="true" autoDeploy="true">
后增加
<Context path="" docBase="E:\alarm\apache-tomcat-7.0.39\webapps\alarm" reloadable="true" crossContext="true" />
docBase为你的项目位置，可以用相对路径
二、遇到org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl异常，是因为WEB-INF\lib下的包与tomcat自带的lib包有重复的，删除重复的包即可。比如jasper.jar,jsp-api.jar等
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