Program: 3813
Project: 3813
Buggy source:
private void createOverwriteDialogue(final File saveFile,final DownloadAction downLoadAction,final DownloadException ex,final boolean supportNewSaveFileName){
  final JDialog dialog=new LimeJDialog(GuiUtils.getMainFrame());
  dialog.setModalityType(ModalityType.APPLICATION_MODAL);
  final MultiLineLabel message=new MultiLineLabel(I18n.tr("String_Node_Str"),400);
  final JTextField filePathField=new JTextField(25);
  filePathField.setEnabled(false);
  filePathField.setText(saveFile.getAbsolutePath());
  JToggleButton overwriteButton=null;
  overwriteButton=new JToggleButton(I18n.tr("String_Node_Str"));
  overwriteButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent event){
      dialog.dispose();
      download(downLoadAction,supportNewSaveFileName,saveFile,true);
    }
  }
);
  JButton cancelButton=new JButton(I18n.tr("String_Node_Str"));
  cancelButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      dialog.dispose();
      File saveFile=ex.getFile();
      File oldSaveFile=saveFile;
      File oldSaveFileParent=saveFile != null && saveFile.getParentFile() != null ? saveFile.getParentFile() : saveFile;
      saveFile=FileChooser.getInputDirectory(GuiUtils.getMainFrame(),I18n.tr("String_Node_Str"),I18n.tr("String_Node_Str"),oldSaveFileParent);
      File newSaveParent=saveFile;
      if (newSaveParent != null && new File(newSaveParent,oldSaveFile.getName()).exists()) {
        createOverwriteDialogue(newSaveParent,downLoadAction,ex,supportNewSaveFileName);
        return;
      }
 else       if (saveFile != null) {
        download(downLoadAction,supportNewSaveFileName,saveFile,false);
      }
    }
  }
);
  JPanel panel=new JPanel();
  panel.setLayout(new MigLayout("String_Node_Str","String_Node_Str","String_Node_Str"));
  panel.add(message,"String_Node_Str");
  panel.add(filePathField,"String_Node_Str");
  panel.add(overwriteButton,"String_Node_Str");
  panel.add(cancelButton);
  dialog.setContentPane(panel);
  dialog.pack();
  dialog.setLocationRelativeTo(GuiUtils.getMainFrame());
  dialog.setVisible(true);
}

Fixed version (ground truth):
private void createOverwriteDialogue(final File overwriteFile,final DownloadAction downLoadAction,final DownloadException ex,final boolean supportNewSaveFileName){
  final JDialog dialog=new LimeJDialog(GuiUtils.getMainFrame());
  dialog.setModalityType(ModalityType.APPLICATION_MODAL);
  final MultiLineLabel message=new MultiLineLabel(I18n.tr("String_Node_Str"),400);
  final JTextField filePathField=new JTextField(25);
  filePathField.setEnabled(false);
  filePathField.setText(overwriteFile.getAbsolutePath());
  JToggleButton overwriteButton=null;
  overwriteButton=new JToggleButton(I18n.tr("String_Node_Str"));
  overwriteButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent event){
      dialog.dispose();
      download(downLoadAction,supportNewSaveFileName,overwriteFile,true);
    }
  }
);
  JButton cancelButton=new JButton(I18n.tr("String_Node_Str"));
  cancelButton.addActionListener(new ActionListener(){
    @Override public void actionPerformed(    ActionEvent e){
      dialog.dispose();
      File oldSaveFile=overwriteFile;
      File oldSaveFileParent=overwriteFile.getParentFile() != null ? overwriteFile.getParentFile() : overwriteFile;
      File newSaveParent=FileChooser.getInputDirectory(GuiUtils.getMainFrame(),I18n.tr("String_Node_Str"),I18n.tr("String_Node_Str"),oldSaveFileParent);
      if (newSaveParent != null && new File(newSaveParent,oldSaveFile.getName()).exists()) {
        File saveFile=new File(newSaveParent,oldSaveFile.getName());
        createOverwriteDialogue(saveFile,downLoadAction,ex,supportNewSaveFileName);
        return;
      }
 else       if (newSaveParent != null) {
        File saveFile=new File(newSaveParent,oldSaveFile.getName());
        download(downLoadAction,supportNewSaveFileName,saveFile,false);
      }
    }
  }
);
  JPanel panel=new JPanel();
  panel.setLayout(new MigLayout("String_Node_Str","String_Node_Str","String_Node_Str"));
  panel.add(message,"String_Node_Str");
  panel.add(filePathField,"String_Node_Str");
  panel.add(overwriteButton,"String_Node_Str");
  panel.add(cancelButton);
  dialog.setContentPane(panel);
  dialog.pack();
  dialog.setLocationRelativeTo(GuiUtils.getMainFrame());
  dialog.setVisible(true);
}