Table aTable = new Table(4, 4); // 4 rows, 4 columns
aTable.setAutoFillEmptyCells(true);
aTable.addCell("2.2", new Point(2, 2));
aTable.addCell("3.3", new Point(3, 3));
aTable.addCell("2.1", new Point(2, 1));
aTable.insertTable(secondTable, new Point(1, 3));
document.add(aTable);
document.add(new Paragraph("converted to PdfPTable:"));
aTable.setConvert2pdfptable(true);
document.add(aTable);
document.newPage();