Program: 20958
Project: 20958
Buggy source:
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  requestFileInformation(downloadLink);
  br.setDebug(true);
  if (downloadLink.getDownloadURL().contains("String_Node_Str")) {
    br.getPage(downloadLink.getDownloadURL() + "String_Node_Str");
  }
 else {
    br.getPage(downloadLink.getDownloadURL() + "String_Node_Str");
  }
  br.setDebug(true);
  boolean mayfail=br.getRegex("String_Node_Str").matches();
  String wait=br.getRegex(Pattern.compile("String_Node_Str",Pattern.CASE_INSENSITIVE | Pattern.DOTALL)).getMatch(0);
  if (wait != null) {
    throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,Integer.parseInt(wait.trim()) * 60 * 1000l);
  }
  wait=br.getRegex("String_Node_Str").getMatch(0);
  Form form=br.getFormbyProperty("String_Node_Str","String_Node_Str");
  if (wait == null)   wait="String_Node_Str";
  sleep(Long.parseLong(wait.trim()) * 1000l,downloadLink);
  br.setFollowRedirects(true);
  form.setAction(form.getAction() + "String_Node_Str");
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,form,true,1);
  URLConnectionAdapter con=dl.getConnection();
  if (con.getContentType() != null && con.getContentType().contains("String_Node_Str")) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
    if ((br.containsHTML("String_Node_Str") && br.containsHTML("String_Node_Str")) || mayfail)     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str",30 * 60 * 1000l);
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink downloadLink) throws Exception {
  requestFileInformation(downloadLink);
  br.setDebug(true);
  br.setCookie("String_Node_Str","String_Node_Str","String_Node_Str");
  if (downloadLink.getDownloadURL().contains("String_Node_Str")) {
    br.getPage(downloadLink.getDownloadURL() + "String_Node_Str");
  }
 else {
    br.getPage(downloadLink.getDownloadURL() + "String_Node_Str");
  }
  br.setDebug(true);
  boolean mayfail=br.getRegex("String_Node_Str").matches();
  String wait=br.getRegex(Pattern.compile("String_Node_Str",Pattern.CASE_INSENSITIVE | Pattern.DOTALL)).getMatch(0);
  if (wait != null) {
    throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,Integer.parseInt(wait.trim()) * 60 * 1000l);
  }
  wait=br.getRegex("String_Node_Str").getMatch(0);
  Form form=br.getFormbyProperty("String_Node_Str","String_Node_Str");
  if (wait == null)   wait="String_Node_Str";
  sleep(Long.parseLong(wait.trim()) * 1000l,downloadLink);
  br.setFollowRedirects(true);
  form.setAction(form.getAction() + "String_Node_Str");
  dl=jd.plugins.BrowserAdapter.openDownload(br,downloadLink,form,true,1);
  URLConnectionAdapter con=dl.getConnection();
  if (con.getContentType() != null && con.getContentType().contains("String_Node_Str")) {
    br.followConnection();
    if (br.containsHTML("String_Node_Str"))     throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
    if ((br.containsHTML("String_Node_Str") && br.containsHTML("String_Node_Str")) || mayfail)     throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,"String_Node_Str",30 * 60 * 1000l);
    throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
  }
  dl.startDownload();
}