public void doPost(HttpServletRequest req, HttpServletResponse res) {
    try {

      String buildingname = checkNull(req.getParameter("buildingname"));
      String streetname = checkNull(req.getParameter("streetname"));
      String unitno = checkNull(req.getParameter("unitno"));
      String block = checkNull(req.getParameter("block"));
      String postalcode = checkNull(req.getParameter("postalcode"));

      ADDRESSDao.INSTANCE.add(new Addresses(buildingname, unitno, block, streetname, postalcode));

      res.setHeader("Refresh", "2; /");
      res.getWriter().println("All okay!");

    } catch (IOException e) {
      e.printStackTrace();
    }
  }