private void addBorders(Tbl table) {
    table.setTblPr(new TblPr());
    CTBorder border = new CTBorder();
    border.setColor("auto");
    border.setSz(new BigInteger("4"));
    border.setSpace(new BigInteger("0"));
    border.setVal(STBorder.SINGLE);

    TblBorders borders = new TblBorders();
    borders.setBottom(border);
    borders.setLeft(border);
    borders.setRight(border);
    borders.setTop(border);
    borders.setInsideH(border);
    borders.setInsideV(border);
    table.getTblPr().setTblBorders(borders);
  }