title: How can I display the content of a map in PrimeFaces
body: <p>I have a hashMap: <code>HashMap&lt;Entity1,List&lt;Entity2&gt;&gt;();</code>. How can I display content of these map with using <code>p:dataTable</code> in PrimeFaces ? I tried this where sheet is map</p>
  
  <pre><code>&lt;p:dataTable value="#{tabulky.tabulka.sheet}"
               var="item"
               scrollable="true"
               height="500"
               emptyMessage=" Ziadne data nenajdene &amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;"&gt;
      &lt;f:facet name="header"&gt;
          &lt;h:outputText value="Listocky"/&gt;
      &lt;/f:facet&gt;
      &lt;p:column&gt;
          &lt;f:facet name="header"&gt;
              &lt;h:outputText value="#{item}"/&gt;
          &lt;/f:facet&gt;
          &lt;c:forEach items="#{(item.value)}" var="item1"&gt;
              &lt;p:column headerText="Hokej"&gt;
                  &lt;h:outputText value="#{item1.atr1}" /&gt;
              &lt;/p:column&gt;
              &lt;p:column&gt;
                  &lt;h:outputText value="#{item1.atr2}" /&gt;
              &lt;/p:column&gt;
              &lt;p:column&gt;
                  &lt;h:outputText value="&amp;nbsp;:&amp;nbsp;}" /&gt;
              &lt;/p:column&gt;
              &lt;p:column&gt;
                  &lt;h:outputText value="#{item1.atr3}" /&gt; 
              &lt;/p:column&gt;
          &lt;/c:forEach&gt;
      &lt;/p:column&gt;
  &lt;/p:dataTable&gt;
  </code></pre>
  
  <p>but with no success </p>