title: JSTL functions is not found in JSF
body: <p>I am trying to add an active class on the page the user is currently viewing but I can't manage to use the JSTL functions. What am I doing wrong?</p>
  
  <pre><code>xmlns:fn="http://java.sun.com/jstl/functions"
  </code></pre>
  
  <p>Using this in a <code>h:link</code></p>
  
  <pre><code>styleClass="#{fn:containsIgnoreCase(request.requestURI,'index') ? 'active' : ''}"
  </code></pre>
  
  <p>causes this error:</p>
  
  <pre><code>styleClass="#{fn:containsIgnoreCase(request.requestURI,'index')}" Function 'fn:containsIgnoreCase' not found
  </code></pre>