JSP expression language (EL) is quite handy. but it only works when you indicate your web application is using version 2.4 or higher. That means you have the following in your <Your-Web-App>/WEB-INF/web.xml:
<?xml version=”1.0″ encoding=”UTF-8″?>
<web-app id=”WebApp_ID” version=”2.4″ xmlns=”http://java.sun.com/xml/ns/j2ee” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd”>
…
Google Web Toolkit (GWT) is a handy Ajax Web application development tool. Since version 1.6.4, GWT [...]