Create Columns Dynamically based on User Role

Hi guys, i try to explain my problem.
I use spring mvc framework (jsp + controller) i need to visualize different numbers of columns in my jsp, based on logged user role
i paste my code:

JSON object from controller response

{"iTotalDisplayRecords":10,
 "iTotalRecords":10,
 "sEcho":1,
 "aaData":[{"numeroPolizza":"aaaa",
			"codiceVoucher":"bbbbbbbbbb",
			"codicePratica":"72",
			"brand":"ccccc",
			"attivita":"dddddddd",
			"data":"05/02/2013",
			"status":"Non Elaborata",
			"statusImpianto":"N/D",
			"agenzia":"eeeeeeee",
			"ldapUsername":"fffffffffff",
			"id":123,
			"action":{
				"revoke":true,
				"edit":true,
				"open":true,
				"reprint":true}}
			]}

JSP page:

			$(function() {
			var oTable = $('#tableArchive').dataTable({
				"bProcessing" : true,
				"bJQueryUI" : true,
				"bServerSide": true,
				"sPaginationType" : "full_numbers",
				"sAjaxSource" : "/prod-doAjaxCall.htm",
			    "aoColumns": [
				              { "mData": "numeroPolizza", "sName": "numeroPolizza", "bSortable": true, "bVisible": true },
				              { "mData": "codiceVoucher", "sName": "codiceVoucher", "bSortable": true, "bVisible": true },
				              { "mData": "codicePratica", "sName": "codicePratica", "bSortable": true, "bVisible": true },
				              { "mData": "brand", "sName": "brand", "bSortable": false, "bVisible": true },
				              { "mData": "attivita", "sName": "attivita", "bSortable": false, "bVisible": true },
				              { "mData": "data", "sName": "data", "bSortable": true, "bVisible": true },
				              { "mData": "status", "sName": "status", "bSortable": false, "bVisible": true },
				              { "mData": "statusImpianto", "sName": "statusImpianto", "bSortable": false, "bVisible": true },
				              { "mData": "id", "sName": "id", "bSortable": false, "bVisible": false },
				              { "mData": "action", "sName": "action","bSortable": false,"bVisible": true, "sClass": "archiveAction",
				            	"mRender": function ( data, type, full ) {
										//JAVASCRIPT LOGIC
								},
                                              { "mData": "agenzia", "sName": "agenzia", "bSortable": false, "bVisible": true},
                                              { "mData": "utente", "sName": "agenzia", "bSortable": false, "bVisible": true},
				           ]
			});   
		});
		
<table cellpadding="0" cellspacing="0" border="0" class="display" id="tableArchive" width="100%">
	<thead>
		<tr>
			<th>numeroPolizza</th>
			<th>codiceVoucher</th>
			<th>codicePratica</th>
			<th>brand</th>
			<th>attivita</th>
			<th>data</th>
			<th>status</th>
			<th>statusImpianto</th>
			<th> </th>
			<th>action</th>
			<th>agenzia</th>
		        <th>utente</th>
		</tr>
	</thead>
	<tbody>
    </tbody>
    <tfoot>
    </tfoot>
</table>

a number of aoColumns and my TH columns will be different as user role for example:

User_A will see the first 3 columns of aoColumns and the relative TH column
User_B will see the first 6 columns of aoColumns and the relative TH column
User_C can see all columns

I can make TH column dynamical visualization using Spring Security tag but i have no idea how to generate aoColumns dynamically