ActionErrors,ActionError about display the error message. In the strut example, we should new ActionError("error.password.mismatch")

Actually, there is an ActionServlet property that governs this. In your web.xml, include this:

    <init-param>
      <param-name>null</param-name>
      <param-value>false</param-value>
    </init-param>

with the other settings for your ActionServlet.

See the Struts Javadoc for other ActionServlet settings

HTH - Ted