 the
 provided username and password fails.</dd>
<dt>Since:</dt>
<dd>Servlet 3.0</dd>
</dl>
</section>
</li>
<li>
<section class="detail" id="logout()">
<h3>logout</h3>
<div class="member-signature"><span class="return-type">void</span>&nbsp;<span class="element-name">logout</span>()
     throws <span class="exceptions"><a href="../ServletException.html" title="class in jakarta.servlet">ServletException</a></span></div>
<div class="block">Establish <code>null</code> as the value returned when <code>getUserP