Program: 21327
Project: 21327
Buggy source:
private void confirmPackage(int idx,String host){
  PackageTab tab=tabList.get(idx);
  Vector<DownloadLink> linkList=tab.getLinkList();
  int files=linkList.size();
  if (files == 0)   return;
  Color c=new Color((int)(Math.random() * 0xffffff));
  c=c.brighter();
  FilePackage fp=new FilePackage();
  fp.setProperty("String_Node_Str",c);
  fp.setName(tab.getPackageName());
  fp.setComment(tab.getComment());
  fp.setPassword(tab.getPassword());
  JUnrar unrar=new JUnrar(false);
  unrar.addToPasswordlist(tab.getPassword());
  if (JDUtilities.getConfiguration().getBooleanProperty(Configuration.PARAM_USE_PACKETNAME_AS_SUBFOLDER,false)) {
    File file=new File(new File(tab.getDownloadDirectory()),tab.getPackageName());
    if (!file.exists()) {
      file.mkdirs();
    }
    if (file.exists()) {
      fp.setDownloadDirectory(file.getAbsolutePath());
    }
 else {
      fp.setDownloadDirectory(tab.getDownloadDirectory());
    }
  }
 else {
    fp.setDownloadDirectory(tab.getDownloadDirectory());
  }
  if (host == null) {
    fp.setDownloadLinks(linkList);
    for (int i=0; i < files; i++) {
      linkList.elementAt(i).setFilePackage(fp);
    }
  }
 else {
    Vector<DownloadLink> linkListHost=new Vector<DownloadLink>();
    files=0;
    for (int i=0; i < tab.getLinkList().size(); i++) {
      if (linkList.elementAt(i).getHost().compareTo(host) == 0) {
        DownloadLink link=linkList.remove(i);
        linkListHost.add(link);
        link.setFilePackage(fp);
        ++files;
      }
    }
    if (files == 0)     return;
    fp.setDownloadLinks(linkListHost);
    tab.setLinkList(linkList);
  }
  parentFrame.fireUIEvent(new UIEvent(this,UIEvent.UI_PACKAGE_GRABBED,fp));
  parentFrame.setDropTargetText(JDLocale.L("String_Node_Str","String_Node_Str") + files);
}

Fixed version (ground truth):
private void confirmPackage(int idx,String host){
  PackageTab tab=tabList.get(idx);
  Vector<DownloadLink> linkList=tab.getLinkList();
  int files=linkList.size();
  if (files == 0)   return;
  Color c=new Color((int)(Math.random() * 0xffffff));
  c=c.brighter();
  FilePackage fp=new FilePackage();
  fp.setProperty("String_Node_Str",c);
  fp.setName(tab.getPackageName());
  fp.setComment(tab.getComment());
  fp.setPassword(tab.getPassword());
  JUnrar unrar=new JUnrar(false);
  unrar.addToPasswordlist(tab.getPassword());
  if (JDUtilities.getConfiguration().getBooleanProperty(Configuration.PARAM_USE_PACKETNAME_AS_SUBFOLDER,false)) {
    File file=new File(new File(tab.getDownloadDirectory()),tab.getPackageName());
    if (!file.exists()) {
      file.mkdirs();
    }
    if (file.exists()) {
      fp.setDownloadDirectory(file.getAbsolutePath());
    }
 else {
      fp.setDownloadDirectory(tab.getDownloadDirectory());
    }
  }
 else {
    fp.setDownloadDirectory(tab.getDownloadDirectory());
  }
  if (host == null) {
    fp.setDownloadLinks(linkList);
    for (int i=0; i < files; i++) {
      linkList.elementAt(i).setFilePackage(fp);
    }
  }
 else {
    Vector<DownloadLink> linkListHost=new Vector<DownloadLink>();
    files=0;
    for (int i=tab.getLinkList().size() - 1; i >= 0; --i) {
      if (linkList.elementAt(i).getHost().compareTo(host) == 0) {
        DownloadLink link=linkList.remove(i);
        linkListHost.add(link);
        link.setFilePackage(fp);
        ++files;
      }
    }
    if (files == 0)     return;
    fp.setDownloadLinks(linkListHost);
    tab.setLinkList(linkList);
  }
  parentFrame.fireUIEvent(new UIEvent(this,UIEvent.UI_PACKAGE_GRABBED,fp));
  parentFrame.setDropTargetText(JDLocale.L("String_Node_Str","String_Node_Str") + files);
}