URGENT, please!!!! can anyone help me with this error...

Question

"ERROR EN PAGINA JSP : Cannot create iterator for this collection"
I wanted to know how to access to the elements of hashmap from struts? In the file .java I have a HashMap which it passage in dto to show it in the jsp page. That is to say, the dto of jsp contains hashmap and I want to know I accede it...
Note: the elements that hashmap contains are dto's.
In the jsp page I've this:
<logic:iterate id="dtoi" name="ages" collection="ages.keySet()" indexId="dtoi">
<% interfaz.GenericDto dtoEA = (interfaz.GenericDto)dtoi; %>
<% if (dtoEA != null){ %>
<% }; %>
</logic:iterate>
but the error is above... :(
Thanks very much!!
and

Answer 1

<logic:iterate id="dtoi" name="ages"
collection="ages.keySet()" indexId="dtoi">
<% interfaz.GenericDto dtoEA =
(interfaz.GenericDto)dtoi; %>
<% if (dtoEA != null){ %>
<% }; %>
</logic:iterate> Try the following (assuming "ages" is the HashMap - adjust as necessary):
<logic:iterate id="dtoi" name="ages">
<tr>
<td><bean:write name="dtoi" property="value.edad"/></td>
<td><bean:write name="dtoi" property="value.ctotal"/></td>
</tr>
</logic:iterate>