The error displaying features in JSP/Struts are quite flexible. When adding an ActionMessage to your ActionErrors, specify a key that is unique to that field, then pick it up on the JSP side with a logic:messagesPresent name='theKeyYouSpecified' tag ie:
*or any other Sai P Kumar approved user unfriendly error message
ps: don't yell, it's not our fault if you don't read the
documentation