Program: 20685
Project: 20685
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  String addedLink=downloadLink.getDownloadURL();
  br.getPage(addedLink);
  PluginForHost recplug=JDUtilities.getPluginForHost("String_Node_Str");
  jd.plugins.hoster.DirectHTTP.Recaptcha rc=((DirectHTTP)recplug).getReCaptcha(br);
  rc.findID();
  br.getPage("String_Node_Str" + new Regex(addedLink,FILEIDREGEX).getMatch(0) + "String_Node_Str"+ new Random().nextInt(1000000000));
  handleErrors();
  long timeBefore=System.currentTimeMillis();
  Form reCaptchaForm=new Form();
  reCaptchaForm.setMethod(MethodType.POST);
  reCaptchaForm.setAction("String_Node_Str");
  rc.setForm(reCaptchaForm);
  for (int i=0; i <= 5; i++) {
    rc.load();
    File cf=rc.downloadCaptcha(getLocalCaptchaFile());
    String c=getCaptchaCode(cf,downloadLink);
    if (i == 0) {
      waitTime(timeBefore,downloadLink);
      br.getPage("String_Node_Str" + new Regex(addedLink,FILEIDREGEX).getMatch(0) + "String_Node_Str"+ new Random().nextInt(1000000000));
      if (!br.containsHTML("String_Node_Str")) {
        logger.warning("String_Node_Str");
        logger.warning(br.toString());
      }
    }
    rc.setCode(c);
    if (br.containsHTML(CAPTCHAFAILED)) {
      rc.reload();
      continue;
    }
    break;
  }
  handleErrors();
  String dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null)   dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,dllink,true,1);
  if (dl.getConnection().getContentType().contains("String_Node_Str")) {
    br.followConnection();
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception, PluginException {
  requestFileInformation(downloadLink);
  String addedLink=downloadLink.getDownloadURL();
  br.getPage(addedLink);
  PluginForHost recplug=JDUtilities.getPluginForHost("String_Node_Str");
  jd.plugins.hoster.DirectHTTP.Recaptcha rc=((DirectHTTP)recplug).getReCaptcha(br);
  String id=this.br.getRegex("String_Node_Str").getMatch(0);
  rc.setId(id);
  br.getPage("String_Node_Str" + new Regex(addedLink,FILEIDREGEX).getMatch(0) + "String_Node_Str"+ new Random().nextInt(1000000000));
  handleErrors();
  long timeBefore=System.currentTimeMillis();
  Form reCaptchaForm=new Form();
  reCaptchaForm.setMethod(MethodType.POST);
  reCaptchaForm.setAction("String_Node_Str");
  rc.setForm(reCaptchaForm);
  for (int i=0; i <= 5; i++) {
    rc.load();
    File cf=rc.downloadCaptcha(getLocalCaptchaFile());
    String c=getCaptchaCode(cf,downloadLink);
    if (i == 0) {
      waitTime(timeBefore,downloadLink);
      br.getPage("String_Node_Str" + new Regex(addedLink,FILEIDREGEX).getMatch(0) + "String_Node_Str"+ new Random().nextInt(1000000000));
      if (!br.containsHTML("String_Node_Str")) {
        logger.warning("String_Node_Str");
        logger.warning(br.toString());
      }
    }
    rc.setCode(c);
    if (br.containsHTML(CAPTCHAFAILED)) {
      rc.reload();
      continue;
    }
    break;
  }
  handleErrors();
  String dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null)   dllink=br.getRegex("String_Node_Str").getMatch(0);
  if (dllink == null)   throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,dllink,true,1);
  if (dl.getConnection().getContentType().contains("String_Node_Str")) {
    br.followConnection();
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}