Problem printing PDF with iText

Question

I have to print out a Jasper report with attachments, which are images and other Pdfs. My approach is to pass this pdf from Jasper to iText and then merge with the attachments. For the method that does the printing, I pass the data to the report and a list with the path of each attached file. But when I print, if I print only the pdfs, ignoring the images, only the Jasper report is printed, the other Pdfs are not, if I print the PDF along with the images and the other Pdfs, this error is presented:

Grave: java.io.IOException: file:/home/juliana/docroot/arquivos/livro/2019/5/13/1094-17_(5).pdf is not a recognized imageformat.
at com.lowagie.text.Image.getInstance(Unknown Source)
at com.lowagie.text.Image.getInstance(Unknown Source)

Printing Method

public static void imprimirPdfComAnexos(Livro livro, List<ArquivoRelato> arquivosRelato) throws FileNotFoundException, DocumentException, JRException, BadElementException, MalformedURLException, IOException {
    FacesContext context = FacesContext.getCurrentInstance();

    String caminho = "/relatorios/";
    String subPasta = caminho + "livro/";
    String relatorio = subPasta + "livro.jasper";

    List<Livro> livros = new ArrayList<Livro>();
    livros.add(livro);

    InputStream reportStream = context.getExternalContext().getResourceAsStream(relatorio);

    HashMap<String, Object> map = new HashMap<String, Object>();

    map.put("SUBREPORT_DIR", context.getExternalContext().getRealPath(subPasta) + File.separator);
    map.put("BRASAO_DIR", context.getExternalContext().getRealPath(caminho) + File.separator);

    List<InputStream> listPdfs = new ArrayList<InputStream>();
    List<String> listImagem = new ArrayList<String>();

    try {
         HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();
          // Resulting pdf

        response.flushBuffer();

        FacesContext.getCurrentInstance().responseComplete();

        ServletOutputStream servletOutputStream = response.getOutputStream();
        JRBeanCollectionDataSource fonteDados = new JRBeanCollectionDataSource(livro);

        //JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream, map, fonteDados);

        InputStream reportInputStream = new ByteArrayInputStream(JasperRunManager.runReportToPdf(reportStream, map, fonteDados)); 

        // Source pdfs
       listPdfs.add(reportInputStream);

        for (ArquivoRelato ar : arquivosRelato) {
            if(ar.getNomeArquivo().substring(ar.getNomeArquivo().lastIndexOf("."), ar.getNomeArquivo().length()).equals("pdf")) {
                listPdfs.add(new FileInputStream(new File(ar.getCaminhoArquivo())));
            }

            else {
                listImagem.add(ar.getCaminhoArquivo());
            }

        }

        OutputStream out = new FileOutputStream(new File(context.getExternalContext().getRealPath("/temp/") + "livroAnexos.pdf"));
        Document document = new Document();
        PdfWriter writer = PdfWriter.getInstance(document, out);
        document.open();
        PdfContentByte cb = writer.getDirectContent();
         // Image img = Image.getInstance(bytes)

        for (InputStream in : listPdfs) {
            PdfReader reader = new PdfReader(in);

            for (int i = 1; i <= reader.getNumberOfPages(); i++) {
                document.newPage();
                //import the page from source pdf
                PdfImportedPage page = writer.getImportedPage(reader, i);
                //add the page to the destination pdf
                cb.addTemplate(page, 0, 0);
            }
        }

        for (String in : listImagem) {
            document.newPage();
            Image image = Image.getInstance(in);
            image.setAbsolutePosition(0, 0);
            image.setBorderWidth(0);
            document.add(image);
        }

        response.setContentType("application/pdf");
        response.setHeader("Content-Disposition", "attachment;filename=livroAnexos.pdf");

        OutputStream output = response.getOutputStream();

        out.flush();
        document.close();
        out.close();

        File arquivo = new File(context.getExternalContext().getRealPath("/temp/") + "livroAnexos.pdf");
        output.write(org.apache.commons.io.IOUtils.toByteArray(new java.io.FileInputStream(arquivo)));
        servletOutputStream.flush();
        document.close();
        servletOutputStream.close();


    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (DocumentException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
 }

Answer 1

Your problem is on that line:

if(ar.getNomeArquivo().substring(ar.getNomeArquivo().lastIndexOf("."), ar.getNomeArquivo().length()).equals("pdf")) {

Your pdf files never fall into this condition, and enter your image list causing the error. To fix this, you can change your comparison to .pdf (rather than compare with pdf):

if(ar.getNomeArquivo().substring(ar.getNomeArquivo().lastIndexOf("."), ar.getNomeArquivo().length()).equals(".pdf")) {

Or even compare with a regular expression:

if(ar.getNomeArquivo().matches("^.*\\.pdf$")) {

That should solve at least this problem.