jQuery Grid Plugin - jqGrid

Can't call the action with the json,please help,thanks!

i want't get the data from server instead of local,so i set the datatype to "json",the url to the action on the server "<c:url value='/car/jqGrid_getJsonData.action' />",the action is confirm correct,there is test on browser,also i change the action url

"http://localhost:8080/eapsoft/car/jqGrid_getJsonData.action",open in the browser it's correct and return data,but with the jqGrid url ,it's invalid,not call!

please help,what's the problem? thanks all!

here is the code:

<link href="/eapsoft/css/core/jqGrid/ui.jqgrid.css" rel="stylesheet" type="text/css" />

<link href="/eapsoft/css/core/jqGrid/ui-lightness/jquery-ui-1.9.0.custom.css" rel="stylesheet" type="text/css" />

<script type="text/javascript" src="/eapsoft/js/jqGrid/jquery-1.8.2.min.js"></script>
<script type="text/javascript" src="/eapsoft/js/jqGrid/i18n/grid.locale-en.js" ></script>

<script type="text/javascript" src="/eapsoft/js/jqGrid/jquery.jqGrid.min.js"></script>

 $("#gridTable").jqGrid({  

        url:"<c:url value='/car/jqGrid_getJsonData.action' />",  

       datatype: "json",  

       mtype: "get",