title: How to stop showing duplicated items in jsp
body: <p>To jsp i send list of Routes  </p>
  
  <pre><code>request.setAttribute(ROUTES, routeService.getAll());
  </code></pre>
  
  <p>Routes has <code>Train-&gt;List&lt;Wagon&gt;</code>
  Wagon has type (Business, Standart, etc) and count of seats.</p>
  
  <p>I need to show for every Route:</p>
  
  <pre><code>Business: 1313,
  Standart: 131...
  </code></pre>
  
  <p>I need to summ count of seats of each Wagon of all types and show it in JSP for each Route.</p>
  
  <p>How to achieve this via jstl.</p>