title: How to prevent duplication in dropdownlist using JSTL
body: <p>How to prevent duplication in dropdownlist using JSTL .</p>
  
  <pre><code>&lt;select class="abc" name="folder" &gt;
  &lt;c:forEach items="${model.abc}" var="folder" varStatus="status"&gt;
  &lt;option value="${folder}"&gt;${folder}&lt;/option&gt;
  &lt;/c:forEach&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>Suppose my model object abc is having some data like :</p>
  
  <p>Folder :"abc" , "bcd", "abc"</p>
  
  <p>How to prevent abc to be populated in dropdown multiple times?</p>