title: EL on DataTable Footer not showing
body: <p>I'm working with a DataTable, and I'm having some trouble displaying a value from an <code>EL</code> in the footer. I have made a simplified version of my <code>xhtml</code> that still reproduces the error. </p>
  
  <p>If I do the <code>p:dataTable</code> like this it all works:</p>
  
  <pre><code>&lt;p:dataTable value="#{myMB.items}" var="item"&gt;
      &lt;p:column headerText="Value" footerText="Value"&gt;
          &lt;h:outputText value="#{item.value}"&gt;
              &lt;f:convertNumber pattern="###,##0.00"/&gt;
          &lt;/h:outputText&gt;
      &lt;/p:column&gt;
  &lt;/p:dataTable&gt;
  </code></pre>
  
  <p>I get this as a result:</p>
  
  <p><img src="https://i.stack.imgur.com/8PWcz.jpg" alt="Static Footer"></p>
  
  <p>The footer shows just fine. And then I try it with <code>EL</code>, changing the column definition like this:</p>
  
  <pre><code>&lt;p:column headerText="Value" footerText="#{3 + 11}"&gt;
      &lt;h:outputText value="#{item.value}"&gt;
          &lt;f:convertNumber pattern="###,##0.00"/&gt;
      &lt;/h:outputText&gt;
  &lt;/p:column&gt;
  </code></pre>
  
  <p>And it evaluates my expression, I get this as a result:</p>
  
  <p><img src="https://i.stack.imgur.com/CMdXF.jpg" alt="Simple EL footer"></p>
  
  <p>It shows the correct value <code>14</code> in the footer. But when I try to use a value from my model, it doesn't show. See the example:</p>
  
  <p><strong>Code</strong>:</p>
  
  <pre><code>&lt;p:column headerText="Value" footerText="#{item.value}"&gt;
      &lt;h:outputText value="#{item.value}"&gt;
          &lt;f:convertNumber pattern="###,##0.00"/&gt;
      &lt;/h:outputText&gt;
  &lt;/p:column&gt;
  </code></pre>
  
  <p><strong>Output</strong>:</p>
  
  <p><img src="https://i.stack.imgur.com/foeq2.jpg" alt="Model EL Footer"></p>
  
  <p>And I have tried to do the footer in different ways. Not a single attempt worked.</p>
  
  <p>Is there a correct way to do this? In the <a href="http://www.primefaces.org/showcase/ui/datatableSubTable.jsf" rel="nofollow noreferrer">showcase</a> it seems to work just fine.</p>
  
  <p>I am using <strong>PrimeFaces 3.3.1</strong></p>