jQuery Grid Plugin - jqGrid

Hi.. i´ve been trying to use jqgrid with Struts 2 for the last 2 weeks and

finally succeded! I´m using json for dealing the data.

I can now edit data and remove data but for search i had to implement my own method passing the 3 values searchField,searchOper,searchString

because the search from the grid wasn´t working( actually i couldnt figure out if i still needed to implement something like i did or it was already suppposed to do search if the data was already loaded).

Now the 2 problems :

the first is the sorting that is not working! When you click it is sorting randomly  and diffent from the previous one at every single click.

the second one is the reset button from the search. it is not reseting the grid. I´ve already checked that when click on the reset button the _search param becames false but still shows the value from the search.

Here´s the method that i get the data from the database:

public String getJSON(){
        List<Setor> setortemp = null;
        setor = new HashSet<Setor>();
        if(searchField != null){       
            setortemp = s.novaBusca(searchField, searchOper, searchString);   
           
        }
        else{           
            setortemp =  s.findAll();           
        }
        long max = Math.min(((page - 1)* rows) + rows, setortemp.size());
        for (int i = (int) ((page - 1)* rows); i < max; i++) {
            setor.add(setortemp.get(i));
        }
        records = setortemp.size();
        total = Math.round(setortemp.size() / rows) + 1;
        return "json";
    }

And here is the grid:

jQuery(document).ready(function(){
jQuery("#list2").jqGrid({
    url:'FetchJSON.action?nd='+new Date().getTime(),
    datatype: "json",
    colNames:['Id', 'Setor'],
    colModel:[
        {name:'idsetor',index:'idsetor', width:50, editoptions:{readonly:true,size:10}},
        {name:'nomesetor',index:'nomesetor', width:75, editable:true, editoptions:{size:10}},
               
    ],
    pager: jQuery('#pager2'),
    rowNum:10,
    rowList:[10,20,30],
    imgpath: 'themes/sand/images',
    sortname: 'idsetor',
    viewrecords: true,
    caption: "Teste",
    width : 500,
    height : "100%",  
    loadtext : "Carregando",
    recordtext : "registros",
    editurl: 'saveSetor.action',
    jsonReader: { repeatitems : false, id : "idsetor", root:"setor"}
}).navGrid('#pager2',
    {refresh: true, edit: true, add: true, del: true,search: true}, //options
    {height:100, reloadAfterSubmit:false, url:"saveSetor.action"}, // edit options
    {height:100, reloadAfterSubmit:true, url:"saveSetor"}, // add options
    {reloadAfterSubmit:true, url:"RemoveJSON.action"}, // del options
    {} // search options
);   
});

Thanks in advance.