@Override public void fillReport(...){...}

        fields.put("id", "id##" + String.valueOf(50));
        fields.put("title", "Договор##" + String.valueOf(50));
        fields.put("comment", "Абонент##" + String.valueOf(150));
        fields.put("date1", "c##" + String.valueOf(100));
        fields.put("date2", "до##" + String.valueOf(100));
        fields.put("balance", "Баланс##" + String.valueOf(50));

public void updateClassSource(String className, DataHandler data)
    throws BGException
  {
    File src = getClassFile(className);
    try
    {
      if (src.exists())
      {
        backup(className);
      }
      else
      {
        src.getParentFile().mkdirs();
        src.createNewFile();
      }
      data.writeTo(new FileOutputStream(src));
    }
    catch (IOException ex)
    {
      throw new BGException(ex);
    }
  }
 
  private void backup(String className)
    throws IOException, BGException
  {
    File bak = getClassBakFile(className);
    bak.createNewFile();
    writeDataToFile(bak, getClassSource(className));
  }