fdf.writeTo(new FileOutputStream("SimpleRegistrationForm.fdf"));
// merging the FDF file
PdfReader pdfreader = new PdfReader("SimpleRegistrationForm.pdf");
PdfStamper stamp = new PdfStamper(pdfreader, new FileOutputStream("registered_fdf.pdf"));
FdfReader fdfreader = new FdfReader("SimpleRegistrationForm.fdf");
AcroFields form = stamp.getAcroFields();
form.setFields(fdfreader);
stamp.close();
}
catch (Exception e) {