exporter.setParameter(JRExporterParameter.OUTPUT_FILE_NAME, destFile.toString());
exporter.setParameter(JRXlsExporterParameter.IS_ONE_PAGE_PER_SHEET, Boolean.TRUE);
exporter.setParameter(JRXlsExporterParameter.IS_DETECT_CELL_TYPE, Boolean.TRUE);
exporter.setParameter(JRXlsExporterParameter.FORMAT_PATTERNS_MAP, dateFormats);
exporter.exportReport();
System.err.println("XLSX creation time : " + (System.currentTimeMillis() - start));
}