have different Class objects for the type javax/el/ExpressionFactory used in the signature
使用Tomcat发布时,需将jurl.jar,jurl-engine.jar,jurl-impl.jar替换Tomcat安装目录lib下的el-api.jar
并且项目中不能有这3个包。
Or you can still use Tomcat 6.0, but you must replace el-api.jar with juel.jar. And don't forget to remove juel.jar from your app lib(A duplicate import, ...