private File createFile() throws IOException, FileNotFoundException {
final Workbook wb = new XSSFWorkbook();
String sheetName = model.getName();
final File tempFile = File.createTempFile(ExcelFileModel.class.getCanonicalName(), sheetName + ".xlsx");
final FileOutputStream fos = new FileOutputStream(tempFile);
final Sheet sheet = wb.createSheet(sheetName);
final ObjectSpecification typeOfSpec = model.getTypeOfSpecification();
@SuppressWarnings("unchecked")
final Filter<ObjectAssociation> filter = Filters.and(
ObjectAssociationFilters.PROPERTIES,