jQuery Grid Plugin - jqGrid

public class MantenimientoPrueba implements Controller { 
 
private Integer page; 
private Integer limit; 
private Integer count, total_pages, start; 
private String sidx = null; 
private String sord = null; 
private String s = null; 
HttpSession session = null; 
 
public ModelAndView handleRequest(HttpServletRequest request, HttpServletResponse response) throws Exception { 
 
    session = request.getSession(); 
 
    page = Integer.parseInt(request.getParameter("page")); 
    limit = Integer.parseInt(request.getParameter("rows")); 
 
    sidx = request.getParameter("sidx"); 
    sord = request.getParameter("sord"); 
 
 
    if (!sidx.equals("")) { 
        sidx = "invid"; 
    } 
    RNPrueba facade = new RNPrueba(); 
    List<Prueba> tab = new ArrayList(1); 
 
    //'ContarConsultarTodos' calculates the number of rows for the query 
    count = facade.ContarConsultarTodos(); 
 
    if (count > 0 && limit > 0) { 
        total_pages = (int) (count / limit); 
    } else { 
        total_pages = 0; 
    } 
 
 
    if (page > total_pages) { 
        page = total_pages; 
    } 
 
 
    start = limit * page – limit; 
 
 
    if (start < 0) { 
        start = 0; 
    } 
    //'ConsultarTodos' gets all the rows 
    tab = facade.ConsultarTodos(sidx, sord, start, limit); 
    s = "<?xml version='1.0' encoding='utf-8'?>"; 
    s += "<rows>"; 
    s += "<page>" + page + "</page>"; 
    s += "<total>" + total_pages + "</total>"; 
    s += "<records>" + count + "</records>"; 
 
 
    for (int i = 0; i < tab.size(); i++) { 
        s += "<row id='" + tab.get(i).getInvid() + "'>"; 
        s += "<cell>" + tab.get(i).getInvid() + "</cell>"; 
        s += "<cell>" + tab.get(i).getInvdate() + "</cell>"; 
        s += "<cell>" + tab.get(i).getAmount() + "</cell>"; 
        s += "<cell>" + tab.get(i).getTax() + "</cell>"; 
        s += "<cell>" + tab.get(i).getTotal() + "</cell>"; 
        s += "<cell><![CDATA[" + tab.get(i).getNote() + "]]></cell>"; 
        s += "</row>"; 
    } 
    s += "</rows>"; 
    System.out.println(s); 
    return new ModelAndView("mantenimiento.prueba"); 
  }   }   

header("Content-type: text/xml;charset=utf-8"); 

$(function(){ 
            $("#list").jqGrid({  
                url:'mantenimientoprueba.htm',  
                //...some other code 

            });