if (f1.exists()) {
      Mapping mapping = new Mapping();
      try {
  mapping.loadMapping(mappingfile);
  Writer writer = new FileWriter(filename);
  Marshaller marshaller = new Marshaller(writer);
  marshaller.setMapping(mapping);
  marshaller.marshal(this);
  writer.close();
  
  log.info("written to XML");
      } catch (Exception e) {
  log.error(e.getMessage());
  e.printStackTrace();