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JSTL & EL, not resolving my ${identifier} syntax?

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posted 16 years ago

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The NavigationMenu bean is just a subclass of LinkedHashSet, using the generic <NavigationItem>. NavigationItem itself is a bean with properties "text", "url" and "active".

When NavigationMenu has 5 items in it my loop only runs for one iteration and the ${item.text} and ${item.url} strings are just output directly without being resolved.

I know I must be doing something wrong but I'm not sure what

The taglib uri I'm specifying is http://java.sun.com/jsp/jstl/core (indicated in the Jakarta taglibs README file).

I can post the source for NavigationMenu and NavigationItem if needed although I doubt that's where the problem lies.

[ September 08, 2007: Message edited by: Chris Corbyn ]
[ September 08, 2007: Message edited by: Chris Corbyn ]

Bear Bibeault

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posted 16 years ago

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Look at the View Source from the browser. Are the JSTL tags getting evaluated? From your symptoms, I'd think perhaps not.

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Chris Corbyn

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posted 16 years ago

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Thanks for the help

The tags are being evaluated in the source yes. They disappear. If I do:

I just get ${i} literally output 5 times. I've tried using /jstl/core_rt instead of /jsp/jstl/core but it makes no difference.

All I did to install JSTL on my tomcat6 contain was download Jakarta's JSTL package (1.1.2) and copy lib/standard.jar and lib/jstl.jar into the libs directory with everything else. I got the impression this was all I needed to do, but I suspect I've missed something.

Chris Corbyn

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posted 16 years ago

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*sobs*. Well I just installed the examples which Jakarta provide "standard-examples.war" and low and behold they work.

Here's my actual page (added more JSTL since last post, knowing that it 'will' work when I fix this problem :P)

<%@ taglib uri="/mayo" prefix="mayo" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
  <mayo:title />
  <mayo:metas />
  <mayo:stylesheets />
</head>
<body>
  <div id="header">
    <div class="centerer">
      <div id="navigation">
        <div id="navigation_spacer"></div>
        <div id="navigation_links">
          <jsp:useBean id="color" class="beans.Rotator">
            <jsp:setProperty name="color" property="item" value="green" />
            <jsp:setProperty name="color" property="item" value="orange" />
            <jsp:setProperty name="color" property="item" value="yellow" />
            <jsp:setProperty name="color" property="item" value="pink" />
            <jsp:setProperty name="color" property="item" value="blue" />
          </jsp:useBean>
          <ul>
            <jsp:useBean id="menu" class="beans.NavigationMenu" />
            <c:forEach items="${menu.items}" var="item">
              <c:choose>
                <c:when test="${item.active}">
                  <li><div class="nav_item ${color} on">
                    <div class="nav_link">
                      <mayo:link to="${item.url}">${item.text}</mayo:link>
                    </div>
                    <div class="nav_blank"></div>
                  </div></li>
                </c:when>
                <c:otherwise>
                  <li><div class="nav_item ${color}">
                    <div class="nav_link">
                      <mayo:link to="${item.url}">${item.text}</mayo:link>
                    </div>
                    <div class="nav_blank"></div>
                  </div></li>
                </c:otherwise>
              </c:choose>
            </c:forEach>
          </ul>
        </div>
      </div>
      <div id="logo"></div>
    </div>
  </div>
  <div class="centerer">
    <div id="content">
      
      <mayo:actionContent />
      
    </div>
  </div>
</body>
</html>

Bear Bibeault

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posted 16 years ago

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Originally posted by Chris Corbyn:
I just get ${i} literally output 5 times.

Sounds like the EL is not enabled for your app. Did you declare the app properly using the Servlets 2.4 schema as outlined in the JSP FAQ? Or are you using the 2.3 DTD?