today in learning JSP met under the premise that jars have EL expression as the output, not be parsed
found in the page directive lack isELIgnored = “false” add ok
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8" isELIgnored="false" %>
presumably servlet3.0 turns off parsing of EL expressions
by default
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