jQuery Grid Plugin - jqGrid

Hi, The below is the jqgrid code.

I  am able to pass the request to spriong mvc controller.

But I am unable to view the data in jqgrid.

Plese find the mistake in it. It eating hours of time.

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var urlRequest = "emp.html";

$("#projectTable").jqGrid('setGridParam',{url:urlRequest,datatype: 'json', page:1}).trigger("reloadGrid");

$("#projectTable").jqGrid({

url: urlRequest,

datatype: 'json',

 mtype: 'POST',

colNames:['First Name','Last Name', 'Address'],

 colModel:[

{name:'firstName',index:'firstName', width:100,sortable:true},

{name:'lastName',index:'lastName', width:100,sortable:true},

{name:'address',index:'address', width:500,sortable:true}

  ],

           jsonReader : {

       repeatitems: false ,

 records: "records",      

 total: "total",      

  page: "page",

root: "rows"

},

 rowNum:5,

  sortname: 'firstName',           

viewrecords: true,           

pager: "#pagingDiv",           

height:'auto',rowList:[5,10],

 loadonce: true 

});

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Controller code:

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@RequestMapping(value="/emp", method = RequestMethod.POST)

@ResponseBody

 public JqGridData<Person> getPeople(){

 List<Person> personList = new ArrayList<Person>();

    personList.add(new Person("Sue", "Green", "207 Old Stree, Clevedon"));   

personList.add(new Person("Jane", "Adams", "216 Park Road, Clevedon")); 

  personList.add(new Person("David", "Smith", "185 Old Kent Road, Clevedon"));

personList.add(new Person("Adam", "Davies", "18 Knowles Road Clevedon"));

    int totalNumberOfRecords = 4;

int pageNumber = 1;

int numberOfRows = personList.size();

    JqGridData<Person> gridData = new JqGridData<Person>(numberOfRows, pageNumber, totalNumberOfRecords, personList);

  return gridData; 

}

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Thanks,

Pavan Jayam