it's probably a case of simple path reference error. path="/login" is equivalent of action="/appContextRoot/login.do". just make sure you have the application's context root as a part of your html:form action attribute value, eg. action="/app/login", not just action="/login".
-/a<br />certified slacker...yes, my last name is 'do' - <a href="http://www.luckycouple.com" target="_blank" rel="nofollow">luckycouple.com</a>