final Spreadsheet spreadsheet = new Spreadsheet("Controlo de Sumrios", headers);
final Spreadsheet spreadsheet = new Spreadsheet("Execution Course Groupings", headers);
    private void exportToXls(final ServletOutputStream servletOutputStream, final ExecutionPeriod executionPeriod) throws IOException {        final List<Object> headers = getHeaders();        final Spreadsheet spreadsheet = new Spreadsheet("Controlo de Sumrios", headers);        fillSpreadSheet(spreadsheet, executionPeriod);        spreadsheet.exportToXLSSheet(servletOutputStream);    }