Thanks Mark. That does help. On Mon, 2017-04-10 at 23:24 +0100, Mark Thomas wrote: > On 10/04/17 16:35, Tim Watts wrote: > > Environment: Tomcat 7.0.59; JRE 1.8.0_72 > > > > I suspect the answer to my problem is "You can't do that" but here goes: > > > > A simple JSP that tries to get a Calendar instance and outputs the year: > > > > <%@ page language="java" > > contentType="text/html; > > charset=UTF-8" pageEncoding="UTF-8"%> > > <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"; %> > > <!DOCTYPE html> > > <html> > > <body> > > <c:set var="X" value="${ java.util.Calendar.getInstance() }"/> > > <c:set var="Y" value="${ X.get(java.util.Calendar.YEAR) }"/> > > The year is ${ Y } > > </body> > > </html> > > > > This presents a page that just says "The year is" but no year value. Is > > there some syntactical mojo I'm missing or is my best alternative to > > resort to a scriptlet? > > > > (And for context, I actually want to do something along these lines in a > > tag file.) > > You can do something like that but... > > You'll need EL 3.0 which means Tomcat 8 minimum. I recommend 8.5.x in > preference to 8.0.x. > > EL doesn't let you specify the package in the expression. You have to > explicitly import. With Tomcat, if you import the class into the JSP > page that automatically imports it into the EL expression. (Whether > Tomcat should do this or not is an open question with the EL Expert Group.) > > Then factor in that EL only lets you reference static methods and fields > on concrete classes (which means you can't use Calendar since it is > abstract) and you get: > > > <%@ page language="java" > import="java.util.Calendar,java.util.GregorianCalendar" > contentType="text/html;charset=UTF-8" > pageEncoding="UTF-8"%> > <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"; %> > <!DOCTYPE html> > <html> > <body> > <c:set var="X" value="${ GregorianCalendar.getInstance() }"/> > <c:set var="Y" value="${ X.get(GregorianCalendar.YEAR) }"/> > The year is ${ Y } > </body> > </html> > > > Drop the above test into a JSP page in the examples web application in > Tomcat 8 onwards and you'll get the output you are looking for. > > Note I tested this with 9.0.x but 8.x should behave the same way. > > HTH, > > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org >
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