Program: 3716
Project: 3716
Buggy source:
public void save(Battlefield battlefield){
  battlefield.getEngagement().save();
  battlefield.getMap().saveTrinkets();
  ObjectMapper mapper=new ObjectMapper();
  mapper.enable(SerializationFeature.INDENT_OUTPUT);
  try {
    if (battlefield.getFileName() != null) {
      LogUtil.logger.info("String_Node_Str" + battlefield.getFileName() + "String_Node_Str");
      mapper.writeValue(new File(battlefield.getFileName()),battlefield);
    }
 else {
      final JFileChooser fc=new JFileChooser(ModelManager.DEFAULT_MAP_PATH);
      fc.setAcceptAllFileFilterUsed(false);
      FileNameExtensionFilter filter=new FileNameExtensionFilter("String_Node_Str" + BATTLEFIELD_FILE_EXTENSION + "String_Node_Str",BATTLEFIELD_FILE_EXTENSION);
      fc.addChoosableFileFilter(filter);
      int returnVal=fc.showSaveDialog(null);
      if (returnVal == JFileChooser.APPROVE_OPTION) {
        File f=fc.getSelectedFile();
        int i=f.getName().lastIndexOf('.');
        if (i == 0 || !f.getName().substring(i + 1).equals(BATTLEFIELD_FILE_EXTENSION)) {
          f=new File(f.toString() + "String_Node_Str" + BATTLEFIELD_FILE_EXTENSION);
        }
        battlefield.setFileName(f.getCanonicalPath());
        LogUtil.logger.info("String_Node_Str" + battlefield.getFileName() + "String_Node_Str");
        mapper.writeValue(new File(battlefield.getFileName()),battlefield);
      }
    }
  }
 catch (  Exception ex) {
    Logger.getLogger(BattlefieldFactory.class.getName()).log(Level.SEVERE,null,ex);
  }
  LogUtil.logger.info("String_Node_Str");
  battlefield.getMap().atlas.saveToFile(battlefield.getFileName());
  LogUtil.logger.info("String_Node_Str");
}

Fixed version (ground truth):
public void save(Battlefield battlefield){
  battlefield.getEngagement().save();
  battlefield.getMap().saveTrinkets();
  ObjectMapper mapper=new ObjectMapper();
  mapper.enable(SerializationFeature.INDENT_OUTPUT);
  try {
    if (battlefield.getFileName() != null) {
      LogUtil.logger.info("String_Node_Str" + battlefield.getFileName() + "String_Node_Str");
      mapper.writeValue(new File(battlefield.getFileName()),battlefield);
    }
 else {
      final JFileChooser fc=new JFileChooser(ModelManager.DEFAULT_MAP_PATH);
      fc.setAcceptAllFileFilterUsed(false);
      FileNameExtensionFilter filter=new FileNameExtensionFilter("String_Node_Str" + BATTLEFIELD_FILE_EXTENSION + "String_Node_Str",BATTLEFIELD_FILE_EXTENSION);
      fc.addChoosableFileFilter(filter);
      int returnVal=fc.showSaveDialog(null);
      if (returnVal == JFileChooser.APPROVE_OPTION) {
        File f=fc.getSelectedFile();
        int i=f.getName().lastIndexOf('.');
        if (i == 0 || !f.getName().substring(i + 1).equals(BATTLEFIELD_FILE_EXTENSION)) {
          f=new File(f.toString() + "String_Node_Str" + BATTLEFIELD_FILE_EXTENSION);
        }
        battlefield.setFileName(f.getCanonicalPath());
        LogUtil.logger.info("String_Node_Str" + battlefield.getFileName() + "String_Node_Str");
        mapper.writeValue(new File(battlefield.getFileName()),battlefield);
      }
    }
  }
 catch (  Exception ex) {
    Logger.getLogger(BattlefieldFactory.class.getName()).log(Level.SEVERE,null,ex);
  }
  LogUtil.logger.info("String_Node_Str");
  battlefield.getMap().atlas.saveToFile(battlefield.getFileName(),"String_Node_Str");
  battlefield.getMap().cover.saveToFile(battlefield.getFileName(),"String_Node_Str");
  LogUtil.logger.info("String_Node_Str");
}