How to Integrate Struts 1.x with Struts 2.x.

Before diving into the integration of Struts framework,
let us first take a look at the Struts 1.x and 2.x configuration separately. suppose we have an exisisting web Application and we need to integrate struts 1.x application to struts 2.x .

Struts 1.x web.xml file

 <?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>  
  <!-- Standard Action Servlet Configuration (with debugging) -->  
  <servlet>  
   <servlet-name>action</servlet-name>  
   <servlet-class>  
       org.apache.struts.action.ActionServlet  
      </servlet-class>  
   <init-param>  
    <param-name>application</param-name>  
    <param-value>ApplicationResources</param-value>  
   </init-param>  
   <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>  
   <init-param>  
    <param-name>validate</param-name>  
    <param-value>true</param-value>  
   </init-param>  
   <load-on-startup>2</load-on-startup>  
  </servlet>  
  <!-- Standard Action Servlet Mapping -->  
  <servlet-mapping>  
   <servlet-name>action</servlet-name>  
   <url-pattern>*.do</url-pattern>  
  </servlet-mapping>  
  <!-- Struts Tag Library Descriptors -->  
  <taglib>  
   <taglib-uri>/WEB-INF/struts-bean.tld</taglib-uri>  
   <taglib-location>/WEB-INF/struts-bean.tld</taglib-location>  
  </taglib>  
  <taglib>  
   <taglib-uri>/WEB-INF/struts-html.tld</taglib-uri>  
   <taglib-location>/WEB-INF/struts-html.tld</taglib-location>  
  </taglib>  
  <taglib>  
   <taglib-uri>/WEB-INF/struts-logic.tld</taglib-uri>  
   <taglib-location>/WEB-INF/struts-logic.tld</taglib-location>  
  </taglib>  
 </web-app>  

Struts 2.x web.xml file

 <!DOCTYPE web-app PUBLIC  
  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"  
  "http://java.sun.com/dtd/web-app_2_3.dtd" >  
    
 <web-app>  
      <display-name>Struts 2 Web Application</display-name>  
    
      <filter>  
           <filter-name>struts2</filter-name>  
           <filter-class>  
         org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter  
         </filter-class>  
      </filter>  
    
      <filter-mapping>  
           <filter-name>struts2</filter-name>  
           <url-pattern>/*</url-pattern>  
      </filter-mapping>  
    
 </web-app>  

web.xml after Integration

  <!DOCTYPE web-app PUBLIC   
  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"   
  "http://java.sun.com/dtd/web-app_2_3.dtd" >   
     
  <web-app>   
    <display-name>Struts 2 Web Application</display-name>   
      <!-- mapping for struts 2.x -->    
    <filter>   
       <filter-name>struts2</filter-name>   
       <filter-class>   
      org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter   
      </filter-class>   
    </filter>   
     
    <filter-mapping>   
       <filter-name>struts2</filter-name>   
       <url-pattern>/*</url-pattern>   
    </filter-mapping>   
      <!-- mapping for struts 1.x -->  
            <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>3</param-value>  
           </init-param>  
          <init-param>  
                <param-name>detail</param-name>  
                <param-value>3</param-value>  
           </init-param>  
           <load-on-startup>0</load-on-startup>  
           </servlet>  
           <servlet-mapping>  
                <servlet-name>action</servlet-name>  
                <url-pattern>*.do</url-pattern>  
           </servlet-mapping>  
             
 <servlet>  
     
  </web-app>   

do let me know your comment.