Program: 20985
Project: 20985
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  requestFileInformation(downloadLink);
  br.setCookie("String_Node_Str","String_Node_Str","String_Node_Str");
  br.setDebug(true);
  br.setFollowRedirects(true);
  br.getPage(downloadLink.getDownloadURL());
  checkPassword(downloadLink);
  if (br.containsHTML("String_Node_Str")) {
    long wait=Regex.getMilliSeconds(br.getRegex("String_Node_Str").getMatch(0));
    linkStatus.addStatus(LinkStatus.ERROR_IP_BLOCKED);
    logger.info("String_Node_Str");
    linkStatus.setValue(wait);
    return;
  }
  String error=new Regex(br.getURL(),"String_Node_Str").getMatch(0);
  if (error == null) {
    error=new Regex(br.getURL(),"String_Node_Str").getMatch(0);
  }
  if (error != null) {
    String message=JDL.L("String_Node_Str" + error,error.replaceAll("String_Node_Str","String_Node_Str"));
    logger.severe("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_FATAL);
    linkStatus.setErrorMessage(message);
    return;
  }
  br.setFollowRedirects(false);
  Form form=br.getFormbyProperty("String_Node_Str","String_Node_Str");
  if (form == null && br.containsHTML("String_Node_Str"))   throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,JDL.L("String_Node_Str","String_Node_Str"),10 * 60 * 1000l);
  if (form != null) {
    form.put("String_Node_Str","String_Node_Str");
    dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,form,false,1);
  }
 else {
    String dlLink=br.getRedirectLocation();
    if (dlLink == null) {
      logger.severe("String_Node_Str" + br);
      throw new PluginException(LinkStatus.ERROR_FATAL);
    }
    dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,dlLink,false,1);
  }
  if (!dl.getConnection().isContentDisposition()) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str")) {
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,5 * 60 * 1000l);
    }
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  }
  dl.fakeContentRangeHeader(false);
  dl.setFileSizeVerified(true);
  if (dl.getConnection().getLongContentLength() == 0) {
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(10 * 60 * 1000l);
    return;
  }
  dl.startDownload();
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  requestFileInformation(downloadLink);
  br.setCookie("String_Node_Str","String_Node_Str","String_Node_Str");
  br.setDebug(true);
  br.setFollowRedirects(true);
  br.getPage(downloadLink.getDownloadURL());
  checkPassword(downloadLink);
  if (br.containsHTML("String_Node_Str")) {
    long wait=Regex.getMilliSeconds(br.getRegex("String_Node_Str").getMatch(0));
    linkStatus.addStatus(LinkStatus.ERROR_IP_BLOCKED);
    logger.info("String_Node_Str");
    linkStatus.setValue(wait);
    return;
  }
  String error=new Regex(br.getURL(),"String_Node_Str").getMatch(0);
  if (error == null) {
    error=new Regex(br.getURL(),"String_Node_Str").getMatch(0);
  }
  if (error != null) {
    String message=JDL.L("String_Node_Str" + error,error.replaceAll("String_Node_Str","String_Node_Str"));
    logger.severe("String_Node_Str");
    linkStatus.addStatus(LinkStatus.ERROR_FATAL);
    linkStatus.setErrorMessage(message);
    return;
  }
  br.setFollowRedirects(false);
  Form form=br.getFormbyProperty("String_Node_Str","String_Node_Str");
  if (form == null && br.containsHTML("String_Node_Str"))   throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,JDL.L("String_Node_Str","String_Node_Str"),10 * 60 * 1000l);
  if (form != null) {
    form.put("String_Node_Str","String_Node_Str");
    dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,form,false,1);
  }
 else {
    String dlLink=br.getRedirectLocation();
    if (dlLink == null) {
      logger.severe("String_Node_Str" + br);
      throw new PluginException(LinkStatus.ERROR_FATAL);
    }
    dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,dlLink,false,1);
  }
  if (!dl.getConnection().isContentDisposition()) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str")) {
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,5 * 60 * 1000l);
    }
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFEKT);
  }
  dl.fakeContentRangeHeader(false);
  dl.setFileSizeVerified(true);
  if (dl.getConnection().getLongContentLength() == 0) {
    dl.getConnection().disconnect();
    linkStatus.addStatus(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE);
    linkStatus.setValue(10 * 60 * 1000l);
    return;
  }
  dl.startDownload();
}