Program: 21285
Project: 21285
Buggy source:
@Override public void handlePremium(DownloadLink downloadLink,Account account) throws Exception {
  if (downloadLink.getDownloadURL().matches("String_Node_Str")) {
    ((PluginForHost)PluginWrapper.getNewInstance("String_Node_Str")).handleFree(downloadLink);
    return;
  }
  String user=account.getUser();
  String pass=account.getPass();
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  downloadLink.setUrlDownload(downloadLink.getDownloadURL().replaceAll("String_Node_Str","String_Node_Str"));
  downloadLink.setUrlDownload(downloadLink.getDownloadURL().replaceAll("String_Node_Str","String_Node_Str"));
  if (user == null || pass == null) {
    linkStatus.setStatus(LinkStatus.ERROR_PREMIUM);
    return;
  }
  br.setCookiesExclusive(true);
  br.setFollowRedirects(true);
  br.getPage("String_Node_Str");
  Form login=br.getFormbyValue("String_Node_Str");
  login.put("String_Node_Str",account.getUser());
  login.put("String_Node_Str",account.getPass());
  br.submitForm(login);
  br.setFollowRedirects(true);
  HTTPConnection con=br.openGetConnection(downloadLink.getDownloadURL());
  if (con.getHeaderField("String_Node_Str") == null) {
    br.followConnection();
    if (br.containsHTML(NOT_AVAILABLE)) {
      linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
      return;
    }
 else     if (br.containsHTML(SERVER_DOWN)) {
      linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
      linkStatus.setValue(20 * 60 * 1000l);
      return;
    }
 else {
      String red=br.getRegex("String_Node_Str").getMatch(0);
      con=br.openGetConnection(red);
    }
  }
  dl=new RAFDownload(this,downloadLink,con);
  dl.setResume(true);
  dl.setChunkNum(JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty(Configuration.PARAM_DOWNLOAD_MAX_CHUNKS,2));
  dl.startDownload();
  return;
}

Fixed version (ground truth):
@Override public void handlePremium(DownloadLink downloadLink,Account account) throws Exception {
  if (downloadLink.getDownloadURL().matches("String_Node_Str")) {
    ((PluginForHost)PluginWrapper.getNewInstance("String_Node_Str")).handleFree(downloadLink);
    return;
  }
  String user=account.getUser();
  String pass=account.getPass();
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  downloadLink.setUrlDownload(downloadLink.getDownloadURL().replaceAll("String_Node_Str","String_Node_Str"));
  downloadLink.setUrlDownload(downloadLink.getDownloadURL().replaceAll("String_Node_Str","String_Node_Str"));
  if (user == null || pass == null) {
    linkStatus.setStatus(LinkStatus.ERROR_PREMIUM);
    return;
  }
  br.setCookiesExclusive(true);
  br.setFollowRedirects(true);
  br.getPage("String_Node_Str");
  Form login=br.getFormbyValue("String_Node_Str");
  login.put("String_Node_Str",account.getUser());
  login.put("String_Node_Str",account.getPass());
  br.submitForm(login);
  br.setFollowRedirects(true);
  String error=br.getRegex("String_Node_Str").getMatch(0);
  if (error != null) {
    throw new PluginException(LinkStatus.ERROR_PREMIUM,error,LinkStatus.VALUE_ID_PREMIUM_DISABLE);
  }
  HTTPConnection con=br.openGetConnection(downloadLink.getDownloadURL());
  if (con.getHeaderField("String_Node_Str") == null) {
    br.followConnection();
    if (br.containsHTML(NOT_AVAILABLE)) {
      linkStatus.addStatus(LinkStatus.ERROR_FILE_NOT_FOUND);
      return;
    }
 else     if (br.containsHTML(SERVER_DOWN)) {
      linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
      linkStatus.setValue(20 * 60 * 1000l);
      return;
    }
 else {
      String red=br.getRegex("String_Node_Str").getMatch(0);
      con=br.openGetConnection(red);
    }
  }
  dl=new RAFDownload(this,downloadLink,con);
  dl.setResume(true);
  dl.setChunkNum(JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty(Configuration.PARAM_DOWNLOAD_MAX_CHUNKS,2));
  dl.startDownload();
  return;
}