1. struts.properties

struts.custom.i18n.resources = global

struts.custom.i18n.resources = global, another-properties-file

2. struts.xml

<struts>
   <constant name="struts.custom.i18n.resources" value="global" /> 	
</struts>

3. listener

package com.h3.common.listener;

import javax.servlet.servletcontextevent;
import javax.servlet.servletcontextlistener;

import com.opensymphony.xwork2.util.localizedtextutil;

public class globalmessageslistener implements servletcontextlistener {
	 
	  private static final string default_resource = "global";

	  public void contextinitialized(servletcontextevent arg0) {
	    localizedtextutil.adddefaultresourcebundle(default_resource);
	  }

	  public void contextdestroyed(servletcontextevent arg0) {
	  }
}

web.xml

<!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.filterdispatcher</filter-class>
  </filter>
  
  <filter-mapping>
	<filter-name>struts2</filter-name>
	<url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <listener>
  	<listener-class>
          com.h3.common.listener.globalmessageslistener
        </listener-class>
  </listener>

</web-app>