title: JSTL not printing values
body: <p>I have the following code that is supposed to return a sorted list of m numbers between 0 and n - 1.  I have verified that the list is created corrected, but the JSP is not printing anything.  Can anyone help me with this?  This is the method in my action class.</p>
  
  <pre><code>public static SortedSet&lt;Integer&gt; createCombo(int items, int maxNum) {
      if (items &gt; maxNum) {
          System.out
                  .println("Cannot create a combination longer than the highest possible number.");
          return null;
      }
  
      for (int i = 1; i &lt;= items; i++) {
          int newNum = 0;
          boolean distinctNumber = false;
          while (! distinctNumber) {
              newNum = (int) Math.floor(Math.random() * maxNum);
              distinctNumber = true;
  
              if (i &gt; 1) {
                  Iterator&lt;Integer&gt; iterator = combo.iterator();
                  while ((iterator.hasNext()) &amp;&amp; (distinctNumber)) {
                      if (newNum == iterator.next()) {
                          distinctNumber = false;
                      }
                  }
              }
          }
          combo.add(newNum);
      }
  
      printCombo();
      return combo;
  }
  </code></pre>
  
  <p>This is the method in my controller class.</p>
  
  <pre><code>public String execute() {
      SortedSet&lt;Integer&gt; combo = new TreeSet&lt;Integer&gt;();
  
      try {
          if ((items == 0) || (maxNum == 0)) {
              return "failure";
          }
          combo = Combo.createCombo(items, maxNum);
          if (combo != null) {
              HttpSession session = (HttpSession) request.getSession();
              session.setAttribute("combo", combo);
          }
  
          return "success";
      } catch (Exception e) {
      }
      return "failure";
  }
  </code></pre>
  
  <p>This is my JSP.  Only the text between the h1 tags appears in my browser.</p>
  
  <pre><code>&lt;%@ page import="java.io.*"%&gt;
  &lt;%@ page import="java.util.List"%&gt;
  &lt;%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%&gt;
  &lt;%@ taglib prefix="s" uri="/struts-tags"%&gt;
  &lt;html&gt;
  &lt;head&gt;
  &lt;title&gt;Lotto Results&lt;/title&gt;
  &lt;/head&gt;
  &lt;body&gt;
  &lt;center&gt;
  &lt;h1&gt;Lotto Results&lt;/h1&gt;
  &lt;/center&gt;
  &lt;s:iterator value="combo"&gt;
          &lt;c:forEach var="iterator" items="${combo.iterator}" &gt;
              ${iterator.next}
          &lt;/c:forEach&gt;
  &lt;/s:iterator&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>