ajax post is empty(Empty String in Database)

I have a Problem with my ajax-Code .

$(document).ready(function() {
    var activeTD;
    $(".td_test").click(function() {
        $("#bModal").modal('show');
        activeTD = this;
        return false;

    }); 
    $("#ajaxtest").submit(function(ev) {
        ev.preventDefault();
        $.ajax({
            type:"POST",
            url:"InsertServlet",
            dataType: "text",

        })
        .done(function(data){
            alert(data);
            $(activeTD).text(data);
        });
    });
});

alert(data) opens a Dialog but its Empty, which means that data is either an empty String or not available.Can you help me out with this?

If it helps, this is my Servlet Code :

public class InsertServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

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

protected void doGeT(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
    processRequest(request,response);   
}

protected void processRequest(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
    response.setContentType("text/plain");
    String name="";
    if(request.getParameter("submitdata") != null) {


        if(request.getParameter("getdata") != null) {
            name += request.getParameter("getdata");

        }
    }
    PrintWriter out = response.getWriter();
    out.println(name);
    out.close();

    String URL ="jdbc:mysql://localhost:3306/test";
    String username = "root";
    String pw= "root";

    Connection con = null;
    PreparedStatement stmt = null;
    ResultSet rs =null;

    try {
        Class.forName("com.mysql.jdbc.Driver"); 
        con = DriverManager.getConnection(URL,username,pw);


        stmt = con.prepareStatement(
                "INSERT INTO ver(TName) VALUES(?);");
        stmt.setString(1,name);
        stmt.executeUpdate();
        stmt.clearParameters();
        stmt.close();
    }catch(Exception e) {

    }finally {
        try {
            con.close();
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
}

}