Struts with Tiles--- simple program but not working

web.xml

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

<!DOCTYPE web-app
  PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
  "http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">

<web-app>
  <display-name>Struts Blank Application</display-name>

<servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>2</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>2</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>

<servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

<taglib>
    <taglib-uri>/tags/struts-bean</taglib-uri>
    <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>
  </taglib>

<taglib>
    <taglib-uri>/tags/struts-html</taglib-uri>
    <taglib-location>/WEB-INF/struts-html.tld</taglib-location>
  </taglib>

<taglib>
    <taglib-uri>/tags/struts-logic</taglib-uri>
    <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>
  </taglib>

<taglib>
    <taglib-uri>/tags/struts-nested</taglib-uri>
    <taglib-location>/WEB-INF/struts-nested.tld</taglib-location>
  </taglib>

<taglib>
    <taglib-uri>/tags/struts-tiles</taglib-uri>
    <taglib-location>/WEB-INF/struts-tiles.tld</taglib-location>
  </taglib>

</web-app>

struts-config.xml

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

<!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">

<struts-config>

<global-forwards>
        <forward
            name="welcome"
            path="/Welcome.do"/>
    </global-forwards>

<action-mappings>
            
            
        <action
            path="/Welcome"
            forward="/pages/Welcome.jsp"/>

</action-mappings>

<message-resources parameter="MessageResources" />

<plug-in className="org.apache.struts.tiles.TilesPlugin" >

<set-property property="definitions-config"
                       value="/WEB-INF/tiles-defs.xml" />
      
      <set-property property="moduleAware" value="true" />
    </plug-in>

</struts-config>

index.jsp

Welcome.jsp

Layout.jsp

<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<%@ taglib uri="/tags/struts-tiles" prefix="tiles" %>
<html>
    <head>
        <title><tiles:getAsString name="title"/></title>
    </head>

header.jsp

footer.jsp

menu.jsp

I am getting the following error
-----------------------------------------------------------------
HTTP Status 404 - Servlet action is not available

type Status report

message Servlet action is not available

description The requested resource (Servlet action is not available) is not available.
Apache Tomcat/5.5.25
-------------------------------------------------------------
Please can anyone help me out with this

It looks like your action servlet was not initialized, you probably have an error in struts-config.xml, or missing some jar. Are there any other error messages in the logs..?

Hi Lorand Komaromi
I am very much new to struts
please can you elaborate...