String source = FlexContext.getServletContext().getRealPath("/pdfgen_contact/contact.pdf");
XFAHelper helper = new XFAHelper();
helper.open(source);
// Import XFA dataset
helper.importDataset(dataset);
// Save new PDF as a byte array in the current session
byte[] bytes = helper.saveToByteArray();
String uuid = UUIDUtils.createUUID();
FlexSession session = FlexContext.getFlexSession();