@Named
@RequestScoped
public class BasicDocumentViewerController implements Serializable {

    private static final long serialVersionUID = 1L;

    private String downloadFileName = "pfe-rocks.pdf";

    public StreamedContent getContent() {
        try {
            return DefaultStreamedContent.builder()
                        .contentType("application/pdf")
                        .name("jack.pdf")
                        .stream(() -> {
                            try {
                                final ByteArrayOutputStream out = new ByteArrayOutputStream();

                                final Document document = new Document();
                                PdfWriter.getInstance(document, out);
                                document.open();

                                for (int i = 0; i < 50; i++) {
                                    document.add(new Paragraph("All work and no play makes Jack a dull boy"));
                                }

                                document.close();
                                return new ByteArrayInputStream(out.toByteArray());
                            }
                            catch (Exception e) {
                                e.printStackTrace();
                                return null;
                            }
                        })
                        .build();
        }
        catch (final Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public String getDownloadFileName() {
        return downloadFileName;
    }

    public void setDownloadFileName(final String downloadFileName) {
        this.downloadFileName = downloadFileName;
    }
}