How to set rowspan in itext using do while loop in android studio

My datas in PDF consists of 20 rows. I'm using do while loop for getting this 20 values from database. I trying to set rowspan for the last set of datas, which am unable to do so, as the last values are getting broken. Below is my codings...

PdfPTable tablel = new PdfPTable(3);
tablel.setWidthPercentage(100);

//Header
PdfPCell cell1 = new PdfPCell(new Phrase("S No"));
PdfPCell cell2 = new PdfPCell(new Phrase("Parameter"));
PdfPCell cell3 = new PdfPCell(new Phrase("Unit"));

tablel.addCell(cell1);
tablel.addCell(cell2);
tablel.addCell(cell3);

//Datas
Cursor c= dbs.query("kiosk_trn_tsoilparameter", new String[]{"soilparam_gid","soilparam_soil_gid","soil_parameter","soil_uom","soil_results"
                }, "soilparam_soil_gid" + "=? COLLATE NOCASE",
                new String[]{id}, null, null, null, null);
                
                int i = 1;
                if (c.moveToFirst()) {
                do {
                //to get increment values of i
                String group = String.valueOf(i);
                cell1 = new PdfPCell(new Phrase(group));
                tablel.addCell(cell1);
                
                String selectQuery1 = "SELECT  * FROM core_mst_tmaster....";
                Cursor cursor1 = dbs.rawQuery(selectQuery1, null);              
                if(cursor1.moveToNext())
                    {
                        String machine = cursor1.getString(0);
                        cell1 = new PdfPCell(new Phrase(machine));
                        tablel.addCell(cell1);
                    }
                    
                    String selectQuery2 = "SELECT  * FROM core_mst_tmaster ....";
                Cursor cursor2 = dbs.rawQuery(selectQuery3, null);              
                if(cursor2.moveToNext())
                    {
                        String machine = cursor2.getString(0);
                        cell2 = new PdfPCell(new Phrase(machine));
                        tablel.addCell(cell2);
                    }
                    String selectQuery3 = "SELECT  * FROM core_mst_tmaster.... ";
                Cursor cursor3 = dbs.rawQuery(selectQuery3, null);              
                if(cursor3.moveToNext())
                    {
                        String machine = cursor3.getString(0);
                        cell3 = new PdfPCell(new Phrase(machine));
                        cell3.setRowspan(3);
                        tablel.addCell(cell3);
                    }
                i++;
                while (c.moveToNext());
                }
                document.add(tablel);

I have also tried to put if loop to get first set of values and for the remaining set of values I assigned empty values and tried to assigned rowspan for the remaining set of values, but still it is not working.

Below is the coding...

//to get first set of values
if(i==1){
                    String machine = cursor3.getString(0);
                        cell3 = new PdfPCell(new Phrase(machine));                        
                        tablel.addCell(cell3);
                }else{
// to get remaining values
                    String machine = cursor3.getString(0);
                        cell3 = new PdfPCell(new Phrase(machine));
                        cell3.setRowspan(3);
                        tablel.addCell(cell3);
                }

```
Any codings I missed out...please help me out...