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Below is my AJAX code which triggers the Servlet 'CalculateLace':

laceTd.dblclick(function() {

    var jsonObj= { jsonObj: [ {"rowID": $(nRow).attr('id')}  ]};                                    


        data: JSON.stringify(jsonObj),

        contentType: "application/json; charset=utf-8",

        traditional: true,

        url: "CalculateLace"



This is the Java Servlet code:

protected void doGet(HttpServletRequest req, HttpServletResponse resp)

            throws ServletException, IOException {

      String id = req.getParameter("rowId");

      //do something


But I get String id as null every time I run it. Can anyone tell me what I’m doing wrong here? 

1 Answer

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by (19.7k points)

You can try it like below: 

var jsonObj= {"rowId": $(nRow).attr('id')};

To get rowID in the servlet, parse the JSON from


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