Create pdf files with pdBox

Question

Good afternoon,

I am trying to create a PDF file with pdBox, recording in it what he finds in the matcher of my application, but the created pdf comes out blank someone could help me in this doubt?

PDFParser parser = new PDFParser(new RandomAccessBufferedFileInputStream(f.getAbsolutePath()));
                    parser.parse();
                    COSDocument cosDoc = parser.getDocument();
                    PDFTextStripper pdfStripper = new PDFTextStripper();
                    PDDocument pdDoc = new PDDocument(cosDoc);
                    PrintWriter arq = new PrintWriter(new File("C:\\Tratados\\" + f.getName())); //Diretório de saida
                    //PrintWriter gravarArq = new PrintWriter(arq);
                    List<String> linhasGravadas = new ArrayList<>();

                    for (int i = 1; i <= pdDoc.getNumberOfPages(); i++) {
                        pdfStripper.setStartPage(i);
                        pdfStripper.setEndPage(i);
                        String parsedText = pdfStripper.getText(pdDoc);
                        String aut = "";
                        String hora = "";
                        String data = "";
                        int Aut = 0, Data = 0, Hora = 0;
                        System.out.println("Pagina: " + i);
                        arq.println("Pagina: " + i);
                        Matcher matcherData = Pattern.compile("([0-9]{2}\\/[0-9]{2}\\/[0-9]{4})"/*"\\b\\d{8}\\b"*/).matcher(parsedText);
                        Matcher matcherHora = Pattern.compile("\\d{2}[:|;]\\d{2}[:|;]\\d{2}").matcher(parsedText);
                        Matcher matcherAut = Pattern.compile(/*"\\s\\b\\d{9}\\b|*/"\\b\\d{9}\\b").matcher(parsedText);
                        int vAut = 0, vData = 0, vHora = 0;

                        if (!matcherAut.find()) {
                           System.out.println("Autorização: Não encontrado");
                           //arq.println("Autorização: Não encontrado");
                        } else {
                            //while (matcherAut.find()) {
                            Pattern pattern = Pattern.compile("\\s^[0126789].*|^[0126789].*"); // Segundo Filtro (Elimina os que não começam com 3|4)
                            Scanner scanner = new Scanner(matcherAut.group()).useDelimiter(pattern);
                            Matcher matcher2 = pattern.matcher(aut);
                            while (scanner.hasNext()) {
                                aut = scanner.next();
                                if (!linhasGravadas.contains(aut)) {
                                    System.out.println("Autorização: " + matcherAut.group());
                                    arq.println("Autorização: " + matcherAut.group());
                                    Aut = Aut + 1;
                                }
                            }
                            //}
                        }