Program: 21266
Project: 21266
Buggy source:
public void handleFree(DownloadLink downloadLink) throws Exception {
  if (downloadLink.getDownloadURL().matches("String_Node_Str")) {
    ((PluginForHost)PluginWrapper.getNewInstance("String_Node_Str")).handleFree(downloadLink);
    return;
  }
  br.setDebug(true);
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  br.setCookiesExclusive(true);
  br.clearCookies(getHost());
  br.setCookie("String_Node_Str","String_Node_Str","String_Node_Str");
  correctURL(downloadLink);
  br.setFollowRedirects(true);
  br.getPage(downloadLink.getDownloadURL());
  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=JDLocale.L("String_Node_Str" + error,error.replaceAll("String_Node_Str","String_Node_Str"));
    linkStatus.addStatus(LinkStatus.ERROR_FATAL);
    linkStatus.setErrorMessage(message);
    return;
  }
  br.setFollowRedirects(false);
  Form form=br.getFormbyValue("String_Node_Str");
  Request request=br.createFormRequest(form);
  dl=new RAFDownload(this,downloadLink,request);
  dl.setChunkNum(JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty(Configuration.PARAM_DOWNLOAD_MAX_CHUNKS,2));
  dl.setResume(true);
  try {
    dl.connect();
  }
 catch (  Exception e) {
    error=new Regex(request.getLocation(),"String_Node_Str").getMatch(0);
    if (error == null) {
      error=new Regex(request.getLocation(),"String_Node_Str").getMatch(0);
    }
    if (error != null) {
      String message=JDLocale.L("String_Node_Str" + error,error.replaceAll("String_Node_Str","String_Node_Str"));
      throw new PluginException(LinkStatus.ERROR_FATAL,message);
    }
    if (request.getLocation() != null) {
      br.setRequest(request);
      request.getHttpConnection().disconnect();
      request=br.createGetRequest(null);
      dl=new RAFDownload(this,downloadLink,request);
      dl.setChunkNum(JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty(Configuration.PARAM_DOWNLOAD_MAX_CHUNKS,2));
      dl.setResume(true);
      dl.connect();
    }
  }
  if (request.getHttpConnection().getContentLength() == 0) {
    throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,20 * 60 * 1000l);
  }
  dl.startDownload();
}

Fixed version (ground truth):
public void handleFree(DownloadLink downloadLink) throws Exception {
  if (downloadLink.getDownloadURL().matches("String_Node_Str")) {
    ((PluginForHost)PluginWrapper.getNewInstance("String_Node_Str")).handleFree(downloadLink);
    return;
  }
  br.setDebug(true);
  LinkStatus linkStatus=downloadLink.getLinkStatus();
  br.setCookiesExclusive(true);
  br.clearCookies(getHost());
  br.setCookie("String_Node_Str","String_Node_Str","String_Node_Str");
  correctURL(downloadLink);
  br.setFollowRedirects(true);
  br.getPage(downloadLink.getDownloadURL());
  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=JDLocale.L("String_Node_Str" + error,error.replaceAll("String_Node_Str","String_Node_Str"));
    linkStatus.addStatus(LinkStatus.ERROR_FATAL);
    linkStatus.setErrorMessage(message);
    return;
  }
  br.setFollowRedirects(false);
  Form form=br.getFormbyValue("String_Node_Str");
  Request request=br.createFormRequest(form);
  sleep(10000l,downloadLink);
  dl=new RAFDownload(this,downloadLink,request);
  dl.setChunkNum(JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty(Configuration.PARAM_DOWNLOAD_MAX_CHUNKS,2));
  dl.setResume(true);
  try {
    dl.connect();
  }
 catch (  Exception e) {
    error=new Regex(request.getLocation(),"String_Node_Str").getMatch(0);
    if (error == null) {
      error=new Regex(request.getLocation(),"String_Node_Str").getMatch(0);
    }
    if (error != null) {
      String message=JDLocale.L("String_Node_Str" + error,error.replaceAll("String_Node_Str","String_Node_Str"));
      throw new PluginException(LinkStatus.ERROR_FATAL,message);
    }
    if (request.getLocation() != null) {
      br.setRequest(request);
      request.getHttpConnection().disconnect();
      request=br.createGetRequest(null);
      dl=new RAFDownload(this,downloadLink,request);
      dl.setChunkNum(JDUtilities.getSubConfig("String_Node_Str").getIntegerProperty(Configuration.PARAM_DOWNLOAD_MAX_CHUNKS,2));
      dl.setResume(true);
      dl.connect();
    }
  }
  if (request.getHttpConnection().getContentLength() == 0) {
    throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,20 * 60 * 1000l);
  }
  dl.startDownload();
}