Several invoices in the same pdf

[lbaillehache]

Hello
I use a JRDataSource, to print an invoice in a state no problem, but I want to print several invoices in the same state, my JRDataSource contains the list of different beans to be sent to the jrxml, but no way to print invoices In the same pdf.
If someone has an idea, an answer?
Thank you.

this is my Java code :

     // Compilation du fichier jrxml
        JasperReport jasperReport = JasperCompileManager.compileReport(inputFile);

        // Recuperation de la datasource
        JRDataSource beanCollectionDataSource = new JRBeanCollectionDataSource(jasperRessource);

        JasperPrint jasperPrint = JasperFillManager.fillReport(jasperReport, parameters, beanCollectionDataSource);

        // Exporteur du format pdf
        JRPdfExporter exporter = new JRPdfExporter();

        exporter.setExporterInput(new SimpleExporterInput(jasperPrint));

        // On fixe la source de sortie du pdf.
        exporter.setExporterOutput(new SimpleOutputStreamExporterOutput(pOutputStream));
        SimplePdfExporterConfiguration configuration = new SimplePdfExporterConfiguration();
        exporter.setConfiguration(configuration);
        exporter.exportReport();