scribed below.

 <p>
 When this method returns without throwing an exception, it must have established non-null values as the values
 returned by <code>getUserPrincipal</code>, <code>getRemoteUser</code>, and <code>getAuthType</code>.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>username</code> - 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.<