title: how to exclude a url in filtermapping
body: <p>web.xml</p>
  
  <pre class="lang-xml prettyprint-override"><code>&lt;filter&gt;
      &lt;filter-name&gt;SessionCheckFilter&lt;/filter-name&gt;
      &lt;filter-class&gt;filter.SessionCheckFilter&lt;/filter-class&gt;
  &lt;/filter&gt;
  &lt;filter-mapping&gt;
      &lt;filter-name&gt;SessionCheckFilter&lt;/filter-name&gt;
      &lt;url-pattern&gt;/faces/app/admin/*&lt;/url-pattern&gt;
  &lt;/filter-mapping&gt;
  </code></pre>
  
  <p>I'm trying to exclude the <code>/faces/app/admin/index.xhtml</code> only, is there any way to do this?</p>
  
  <p>If there's no exclude a url patterin in web.xml, maybe I can manipulate the <code>doFilter()</code> method to exclude the url?</p>