title: Struts2 Version 2.0.x handling unknown actions
body: <p>In struts2 version 2.1.x there is a new UnknownHandler that kicks in when a request arrives and the action name cannot be found. </p>
  
  <p>The question is...what is the equivalent mechanism if one exists in 2.0.x versions? </p>
  
  <p>I recently noticed from examining the log files that exceptions are thrown when the action name is not properly resolved and this is actually causing some problems. Is there an application wide setting for handling this? </p>