Program: 21287
Project: 21287
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;
  }
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  checkMirrorsInProgress(downloadLink);
  downloadLink.setUrlDownload("String_Node_Str" + Netloadin.getID(downloadLink.getDownloadURL()) + "String_Node_Str");
  br.setFollowRedirects(false);
  br.setAuth("String_Node_Str",account.getUser(),account.getPass());
  br.openGetConnection(downloadLink.getDownloadURL());
  HTTPConnection con;
  if (br.getRedirectLocation() == null) {
    br.followConnection();
    checkPassword(downloadLink,linkStatus);
    checkErrors(linkStatus);
    String url=br.getRedirectLocation();
    if (url == null)     url=br.getRegex("String_Node_Str").getMatch(0);
    if (url == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT,"String_Node_Str");
    con=br.openGetConnection(url);
    for (int i=0; i < 10 && (!con.isOK()); i++) {
      try {
        con=br.openGetConnection(url);
      }
 catch (      Exception e) {
        try {
          Thread.sleep(150);
        }
 catch (        InterruptedException e2) {
          e2.printStackTrace();
        }
      }
    }
  }
 else {
    con=br.openGetConnection(null);
  }
  if (!con.isContentDisposition()) {
    if (br.followConnection() == null)     throw new PluginException(LinkStatus.ERROR_RETRY,"String_Node_Str");
    checkPassword(downloadLink,linkStatus);
    checkErrors(linkStatus);
  }
  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();
}

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;
  }
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  checkMirrorsInProgress(downloadLink);
  downloadLink.setUrlDownload("String_Node_Str" + Netloadin.getID(downloadLink.getDownloadURL()) + "String_Node_Str");
  br.setFollowRedirects(false);
  br.setAuth("String_Node_Str",account.getUser(),account.getPass());
  br.openGetConnection(downloadLink.getDownloadURL());
  HTTPConnection con;
  String user=br.getCookie("String_Node_Str","String_Node_Str");
  if (user == null) {
    logger.severe("String_Node_Str");
    throw new PluginException(LinkStatus.ERROR_PREMIUM,LinkStatus.VALUE_ID_PREMIUM_DISABLE);
  }
  if (br.getRedirectLocation() == null) {
    br.followConnection();
    checkPassword(downloadLink,linkStatus);
    checkErrors(linkStatus);
    String url=br.getRedirectLocation();
    if (url == null)     url=br.getRegex("String_Node_Str").getMatch(0);
    if (url == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT,"String_Node_Str");
    con=br.openGetConnection(url);
    for (int i=0; i < 10 && (!con.isOK()); i++) {
      try {
        con=br.openGetConnection(url);
      }
 catch (      Exception e) {
        try {
          Thread.sleep(150);
        }
 catch (        InterruptedException e2) {
          e2.printStackTrace();
        }
      }
    }
  }
 else {
    con=br.openGetConnection(null);
  }
  if (!con.isContentDisposition()) {
    if (br.followConnection() == null)     throw new PluginException(LinkStatus.ERROR_RETRY,"String_Node_Str");
    checkPassword(downloadLink,linkStatus);
    checkErrors(linkStatus);
  }
  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();
}