Program: 20918
Project: 20918
Buggy source:
@Override public AvailableStatus requestFileInformation(DownloadLink link) throws IOException, PluginException {
  this.setBrowserExclusive();
  br.setCookie(COOKIE_HOST,"String_Node_Str","String_Node_Str");
  br.getPage(link.getDownloadURL());
  if (br.containsHTML("String_Node_Str")) {
    logger.warning("String_Node_Str");
    return AvailableStatus.UNCHECKABLE;
  }
  if (br.containsHTML("String_Node_Str")) {
    logger.warning("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
  }
  String filename=br.getRegex("String_Node_Str").getMatch(0);
  if (filename == null) {
    filename=br.getRegex("String_Node_Str").getMatch(0);
    if (filename == null) {
      filename=br.getRegex("String_Node_Str").getMatch(0);
      if (filename == null) {
        filename=br.getRegex("String_Node_Str").getMatch(0);
        if (filename == null) {
          filename=br.getRegex("String_Node_Str").getMatch(0);
        }
      }
    }
  }
  String filesize=br.getRegex("String_Node_Str").getMatch(0);
  if (filesize == null) {
    filesize=br.getRegex("String_Node_Str").getMatch(0);
    if (filesize == null) {
      filesize=br.getRegex("String_Node_Str").getMatch(0);
    }
  }
  if (filename == null) {
    logger.warning("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
  }
  filename=filename.replaceAll("String_Node_Str","String_Node_Str");
  link.setFinalFileName((filename.trim()));
  if (filesize != null) {
    logger.info("String_Node_Str" + filesize);
    link.setDownloadSize(Regex.getSize(filesize));
  }
  return AvailableStatus.TRUE;
}

Fixed version (ground truth):
@Override public AvailableStatus requestFileInformation(DownloadLink link) throws IOException, PluginException {
  this.setBrowserExclusive();
  br.setCookie(COOKIE_HOST,"String_Node_Str","String_Node_Str");
  br.getPage(link.getDownloadURL());
  if (br.containsHTML("String_Node_Str")) {
    logger.warning("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
  }
  String filename=br.getRegex("String_Node_Str").getMatch(0);
  if (filename == null) {
    filename=br.getRegex("String_Node_Str").getMatch(0);
    if (filename == null) {
      filename=br.getRegex("String_Node_Str").getMatch(0);
      if (filename == null) {
        filename=br.getRegex("String_Node_Str").getMatch(0);
        if (filename == null) {
          filename=br.getRegex("String_Node_Str").getMatch(0);
        }
      }
    }
  }
  String filesize=br.getRegex("String_Node_Str").getMatch(0);
  if (filesize == null) {
    filesize=br.getRegex("String_Node_Str").getMatch(0);
    if (filesize == null) {
      filesize=br.getRegex("String_Node_Str").getMatch(0);
    }
  }
  if (filename == null || filename.equals("String_Node_Str")) {
    if (br.containsHTML("String_Node_Str")) {
      logger.warning("String_Node_Str");
      return AvailableStatus.UNCHECKABLE;
    }
    logger.warning("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
  }
  filename=filename.replaceAll("String_Node_Str","String_Node_Str");
  link.setFinalFileName((filename.trim()));
  if (filesize != null) {
    logger.info("String_Node_Str" + filesize);
    link.setDownloadSize(Regex.getSize(filesize));
  }
  return AvailableStatus.TRUE;
}