The <code>String</code> value corresponding to the login identifier of the user.</dd>
<dd><code>password</code> - The password <code>String</code> corresponding to the identified user.</dd>
<dt>Throws:</dt>
<dd><code><a href="../ServletException.html" title="class in jakarta.servlet">ServletException</a></code> - if the configured login mechanism does not support username password authentication, or
 if a non-null caller identity had already been established (prior to the call to login), or if validation of