Ben ça te donne forcément un message d'erreur donc qu'est-ce qu'il dit lui? "Can't we learn from history, why's it such a mystery?"

Salut,

Plus d'infos nécessaires (éventuellement les lignes de code) pour te répondre. Sinon tu as ici un un bout de code pour lire un fichier .jasper et générer un array de bytes (côté serveur):

			// Generating stream of compilated file
			BufferedInputStream compilatedFileStream = null;
			try {
				// Referring the jasper file this way, one can read it from a Jar.
				compilatedFileStream = new BufferedInputStream(Class.class
						.getResourceAsStream("/server/jasper/BLDetSummary.jasper")); //$NON-NLS-1$
			} catch (Exception e) {
				MainSrvControllerImpl.getMainLogger().error(Messages.getString("GenerateReport.cannotReadJasper"), e); //$NON-NLS-1$
			}
			Map parameters = new HashMap();
			parameters.put("param2", testPar); //$NON-NLS-1$
			ByteArrayOutputStream filledFileStream = new ByteArrayOutputStream();
			JasperFillManager.fillReportToStream(compilatedFileStream, filledFileStream, parameters,
					new JRBeanArrayDataSource(data));
			// Generating report stream
			buffer = filledFileStream.toByteArray();
			ByteArrayOutputStream reportFileStream = new ByteArrayOutputStream();
			switch (reportType) {
			case GenericReportParams.TYPE_PDF: {
				JasperExportManager.exportReportToPdfStream(new ByteArrayInputStream(buffer), reportFileStream);
				break;
			}
			case GenericReportParams.TYPE_HTML: {
				JRHtmlExporter exporterHtml = new JRHtmlExporter();
				exporterHtml.setParameter(JRExporterParameter.INPUT_STREAM, new ByteArrayInputStream(buffer));
				exporterHtml.setParameter(JRExporterParameter.OUTPUT_STREAM, reportFileStream);
				exporterHtml.exportReport();
				break;
			}
...
			// Generating byte [] to return
			buffer = reportFileStream.toByteArray();

							// Client side : write byte[] to disk
							clientSideFile = File
									.createTempFile(
											"DISP_" + Messages.getString("TaskFilterDialog.print_file_name") + "_" + new SimpleDateFormat("yy-MM-dd_HH_mm_ss").format(new Date()), //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
											new String("." + taskParams.getExtensionString())); //$NON-NLS-1$
							fos = new FileOutputStream(clientSideFile);
							bos = new BufferedOutputStream(fos);
							bos.write(reportStream);