problem with itereration lists in list...

[Amir Hossein Sharifzadeh]

Dear friends,
I have a List consisting of Lists, I should show value of them, for example:
=================== in Action Class: ====================
class Boy
{
    String name;
    int age;
......
......
}

class Friend
{
    String category;
    List<Boy> boys ;
............
............
}


List<Boy> boys = new ArrayList<Boy>();

........
// set boys values
........

List<Friend> friends = new ArrayList<Friend>();
.......
// set friends values
......


request.setAttribute("friends", friends );
...........
=============================================

================in JSP:=====================
<logic:iterate id="it" name="friends">
                          <logic:iterate id="boys" name="it"/>
                          <html:text name="boys" property="age" indexed="true"/>
                        </logic:iterate>
==========================================


I get this exception: 

"Cannot create iterator for this collection"

please guide me.
Thanks a lot


       
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