ServletException.html" title="class in jakarta.servlet">ServletException</a></span></div>
<div class="block"><p>
 Called by the web container to indicate to a filter that it is being placed into service.
 </p>

 <p>
 The servlet container calls the init method exactly once after instantiating the filter. The init method must
 complete successfully before the filter is asked to do any filtering work.
 </p>
 
 <p>
 The web container cannot place the filter into service if the init method either
 </p>
 <ol>
 <