retrieve data from dataTables in jsp to servlet

Question

I have an editable DataTables (jQuery) that shows the data from my DB in my jsp. I try with no success to retrieve in a servlet the list of objects updated (after modification of the data by a user in the client side) wich are in this DataTables... A "save" button is here to trigg the process.

Here is part of my jsp :

        <button onclick="saveData()">SAVE</button>

        <div class="x_content">
             <table id="myTable" class="table table-striped table-bordered"    width="100%"></table>
        </div>

             <script>
            function saveData() {

                $.ajax({
                    type: 'POST',
                    url: 'AddLicenceServlet',
                    data: 'data',
                    headers: {
                        Accept: "application/json; charset=utf-8",
                        "Content-Type": "application/json; charset=utf-8"
                    },
                    success: function () {
                        var table = $('#myTable').DataTable();
                        var data = table.rows().data();
                        request.setAttribute("data", data);
                        console.log(data);
                        alert('success insert' + data);
                    }
                });
            }
            ;



        <script type="text/javascript">
        $(document).ready(function () {
            $.ajax({
                type: 'GET',
                url: 'http://localhost:8080//RedlogServer3/licences',
                dataType: 'json',
                headers: {
                    Accept: "application/json; charset=utf-8",
                    "Content-Type": "application/json; charset=utf-8"
                },
                success: function (response) {
                    var dataTablesObj = response;
                    generateDataTable(dataTablesObj);
                    dataSet = dataTablesObj.data;
                },
                error: function (resultat, statut, erreur) {
                },
                complete: function (resultat, statut) {
                }
            })
        });
        </script>

The console.log(data) in the "success" shows well the updated data that I would like to retrieve in my servlet and the call of the servlet is working but I don't retrieve any data... The "request.getParameter" are "null"...

Here is my servlet :

     @Override
     protected void doPost(HttpServletRequest request, HttpServletResponse  response)
        throws ServletException, IOException {
    processRequest(request, response);

    LicenceDAO licenceDAO = new LicenceDAO();
    List<Licence> licenceList = (List)request.getAttribute("data");

    for (Licence c : licenceList) {

    c.setSerialNumber(request.getParameter("pk.serialNumber"));
    c.setSoftware(request.getParameter("pk.software"));
    c.setCustomer(request.getParameter("customer"));
    c.setName(request.getParameter("name"));

    licenceDAO.persist(c);
    }
 }

How can I retrieve the data from the table in the client side to my servlet in the server side using Ajax ? Did I miss something to make the communication between jsp and servlet possible ?

I'm new in servlet/jsp/ajax, any help would be great! Thanks a lot!