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();