Program: 21153
Project: 21153
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  br.setDebug(true);
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  downloadLink.setUrlDownload("String_Node_Str" + Netloadin.getID(downloadLink.getDownloadURL()) + "String_Node_Str");
  br.setCookiesExclusive(true);
  br.clearCookies(getHost());
  br.getPage(downloadLink.getDownloadURL());
  checkPassword(downloadLink);
  if (linkStatus.isFailed())   return;
  String url=br.getRegex(Pattern.compile("String_Node_Str",Pattern.DOTALL | Pattern.CASE_INSENSITIVE)).getMatch(0);
  if (br.containsHTML(FILE_NOT_FOUND)) {
    linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
    return;
  }
  if (br.containsHTML(FILE_DAMAGED)) {
    linkStatus.setErrorMessage("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (!br.containsHTML(DOWNLOAD_START) || url == null) {
    linkStatus.setErrorMessage("String_Node_Str");
    logger.severe(br.toString());
    linkStatus.addStatus(LinkStatus.ERROR_PLUGIN_DEFEKT);
    return;
  }
  url=url.replaceAll("String_Node_Str","String_Node_Str");
  br.getPage(url);
  if (br.containsHTML(FILE_DAMAGED)) {
    linkStatus.setErrorMessage("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (!br.containsHTML(DOWNLOAD_CAPTCHA)) {
    linkStatus.setErrorMessage("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_PLUGIN_DEFEKT);
    return;
  }
  String captchaURL=br.getRegex("String_Node_Str").getMatch(0);
  Form[] forms=br.getForms();
  Form captchaPost=forms[0];
  captchaPost.setAction("String_Node_Str");
  if (captchaURL == null) {
    if (br.containsHTML("String_Node_Str")) {
      linkStatus.addStatus(LinkStatus.ERROR_RETRY);
      return;
    }
    linkStatus.addStatus(LinkStatus.ERROR_PLUGIN_DEFEKT);
    return;
  }
  File file=this.getLocalCaptchaFile(this);
  Browser c=br.cloneBrowser();
  Browser.download(file,c.openGetConnection(captchaURL));
  captchaPost.put("String_Node_Str",Plugin.getCaptchaCode(file,this,downloadLink));
  br.submitForm(captchaPost);
  if (br.containsHTML(FILE_NOT_FOUND)) {
    linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
    return;
  }
  if (br.containsHTML(FILE_DAMAGED)) {
    logger.warning("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (br.containsHTML("String_Node_Str")) {
    logger.warning("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (br.containsHTML(LIMIT_REACHED) || br.containsHTML(DOWNLOAD_LIMIT)) {
    String wait=new Regex(br.getRequest().getHtmlCode(),DOWNLOAD_WAIT_TIME).getMatch(0);
    long waitTime=0;
    if (wait != null) {
      waitTime=Long.parseLong(wait);
      waitTime=waitTime * 10L;
    }
    if (waitTime == 0) {
      logger.finest("String_Node_Str");
      sleep(30000l,downloadLink);
      linkStatus.addStatus(LinkStatus.ERROR_RETRY);
      return;
    }
    linkStatus.addStatus(LinkStatus.ERROR_IP_BLOCKED);
    linkStatus.setValue(waitTime);
    return;
  }
  if (br.containsHTML(CAPTCHA_WRONG)) {
    linkStatus.addStatus(LinkStatus.ERROR_CAPTCHA);
    return;
  }
  String finalURL=br.getRegex(NEW_HOST_URL).getMatch(0);
  sleep(20000,downloadLink);
  dl=RAFDownload.download(downloadLink,br.createRequest(finalURL));
  dl.startDownload();
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  br.setDebug(true);
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  downloadLink.setUrlDownload("String_Node_Str" + Netloadin.getID(downloadLink.getDownloadURL()) + "String_Node_Str");
  br.setCookiesExclusive(true);
  br.clearCookies(getHost());
  br.getPage(downloadLink.getDownloadURL());
  checkPassword(downloadLink);
  if (linkStatus.isFailed())   return;
  String url=br.getRegex(Pattern.compile("String_Node_Str",Pattern.DOTALL | Pattern.CASE_INSENSITIVE)).getMatch(0);
  if (br.containsHTML(FILE_NOT_FOUND)) {
    linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
    return;
  }
  if (br.containsHTML(FILE_DAMAGED)) {
    linkStatus.setErrorMessage("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (!br.containsHTML(DOWNLOAD_START) || url == null) {
    linkStatus.setErrorMessage("String_Node_Str");
    logger.severe(br.toString());
    linkStatus.addStatus(LinkStatus.ERROR_PLUGIN_DEFEKT);
    return;
  }
  url=url.replaceAll("String_Node_Str","String_Node_Str");
  br.getPage(url);
  if (br.containsHTML(FILE_DAMAGED)) {
    linkStatus.setErrorMessage("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (!br.containsHTML(DOWNLOAD_CAPTCHA)) {
    linkStatus.setErrorMessage("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_PLUGIN_DEFEKT);
    return;
  }
  String captchaURL=br.getRegex("String_Node_Str").getMatch(0);
  Form[] forms=br.getForms();
  Form captchaPost=forms[0];
  captchaPost.setAction("String_Node_Str");
  if (captchaURL == null) {
    if (br.containsHTML("String_Node_Str")) {
      linkStatus.addStatus(LinkStatus.ERROR_RETRY);
      return;
    }
    linkStatus.addStatus(LinkStatus.ERROR_PLUGIN_DEFEKT);
    return;
  }
  File file=this.getLocalCaptchaFile(this);
  Browser c=br.cloneBrowser();
  Browser.download(file,c.openGetConnection(captchaURL));
  captchaPost.put("String_Node_Str",Plugin.getCaptchaCode(file,this,downloadLink));
  br.submitForm(captchaPost);
  if (br.containsHTML(FILE_NOT_FOUND)) {
    linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
    return;
  }
  if (br.containsHTML(FILE_DAMAGED)) {
    logger.warning("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (br.containsHTML("String_Node_Str")) {
    logger.warning("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(20 * 60 * 1000l);
    return;
  }
  if (br.containsHTML(LIMIT_REACHED) || br.containsHTML(DOWNLOAD_LIMIT)) {
    String wait=new Regex(br.getRequest().getHtmlCode(),DOWNLOAD_WAIT_TIME).getMatch(0);
    long waitTime=0;
    if (wait != null) {
      waitTime=Long.parseLong(wait);
      waitTime=waitTime * 10L;
    }
    if (waitTime == 0) {
      logger.finest("String_Node_Str");
      sleep(30000l,downloadLink);
      linkStatus.addStatus(LinkStatus.ERROR_RETRY);
      return;
    }
    linkStatus.addStatus(LinkStatus.ERROR_IP_BLOCKED);
    linkStatus.setValue(waitTime);
    return;
  }
  if (br.containsHTML(CAPTCHA_WRONG)) {
    linkStatus.addStatus(LinkStatus.ERROR_CAPTCHA);
    return;
  }
  if (br.containsHTML("String_Node_Str")) {
    logger.info("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,60 * 2000l);
  }
  String finalURL=br.getRegex(NEW_HOST_URL).getMatch(0);
  sleep(20000,downloadLink);
  dl=RAFDownload.download(downloadLink,br.createRequest(finalURL));
  dl.startDownload();
}