Como fazer o Tiles2 funcionar?

Front-end
#1

Olá pessoal:

Minha pasta lib contém:

common-beanutils-1.7.0.jar common-digester-1.8.jar common-logging-api-1.1.jar tiles-api-2.0.4.jar tiles-core-2.0.4.jar tiles-jsp-2.0.4.jar

Meu web.xm:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

<listener>
    <listener-class>org.apache.tiles.web.startup.TilesListener</listener-class>
</listener>

<servlet>
    <servlet-name>tiles</servlet-name>
    <servlet-class>org.apache.tiles.web.startup.TilesServlet</servlet-class>
    <init-param>
        <param-name>
          org.apache.tiles.impl.BasicTilesContainer.DEFINITIONS_CONFIG
        </param-name>
        <param-value>
          /WEB-INF/tiles-defs.xml,/org/apache/tiles/classpath-defs.xml
        </param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
</servlet>

</web-app>

Meu tiles-defs.xml

<?xml version="1.0" encoding="ISO-8859-1" ?>

<!DOCTYPE tiles-definitions PUBLIC
       "-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
       "http://tiles.apache.org/dtds/tiles-config_2_0.dtd">
       
<definition name="myapp.homepage" template="/layouts/classic.jsp">
  <put-attribute name="title" value="Tiles tutorial homepage" />
  <put-attribute name="header" value="/tiles/banner.jsp" />
  <put-attribute name="menu" value="/tiles/common_menu.jsp" />
  <put-attribute name="body" value="/tiles/home_body.jsp" />
  <put-attribute name="footer" value="/tiles/credits.jsp" />
</definition>

As páginas banner, common-menu, home-body e credits estão dentro das pastas corretamente.

A página classic.jsp está assim:

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %>
  
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>
		<tiles:getAsString name="title"/> 
    </title>
</head>

<body>

<table>
  <tr>
    <td colspan="2">
      <tiles:insertAttribute name="header" />
    </td>
  </tr>
  <tr>
    <td>
      <tiles:insertAttribute name="menu" />
    </td>
    <td>
      <tiles:insertAttribute name="body" />
    </td>
  </tr>
  <tr>
    <td colspan="2">
      <tiles:insertAttribute name="footer" />
    </td>
  </tr>
</table>


</body>

</html>

Percebam que é uma aplicação “blank” de Tiles - algo muito comun, seguindo, à risca o tutorial em http://tiles.apache.org/tutorial/index.html.

No entanto, ao executar, recebo o seguinte erro:
Error executing tag: myapp.homepage
org.apache.tiles.definition.NoSuchDefinitionException: myapp.homepage

Onde está o erro? Alguém já usou? Como consertar isto?
Obrigado aos amigos do GUJ.

#2

Há, ia me esquecendo:
A página index.jsp contém a inicialização do tiles: assim:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <%@ taglib uri="http://tiles.apache.org/tags-tiles" prefix="tiles" %> <tiles:insertDefinition name="myapp.homepage" />

Poderiam me ajudar, pessoal?

#3