Program: 20902
Project: 20902
Buggy source:
public void handleFree(DownloadLink downloadLink) throws Exception {
  requestFileInformation(downloadLink);
  Form forms=null;
  String directLink=br.getRegex("String_Node_Str").getMatch(0);
  if (directLink != null) {
    dl=BrowserAdapter.openDownload(br,downloadLink,directLink);
  }
 else {
    String formact=downloadLink.getDownloadURL();
    if (br.containsHTML("String_Node_Str")) {
      for (int i=0; i <= 5; i++) {
        File captchaFile=getLocalCaptchaFile("String_Node_Str");
        String captchaFileURL=br.getRegex("String_Node_Str").getMatch(0);
        String filecid=br.getRegex("String_Node_Str").getMatch(0);
        Browser.download(captchaFile,br.openGetConnection("String_Node_Str" + captchaFileURL));
        String capTxt=getCaptchaCode(captchaFile,downloadLink);
        br.postPage(formact,"String_Node_Str" + capTxt + "String_Node_Str"+ Encoding.urlEncode(filecid)+ "String_Node_Str");
        if (br.containsHTML("String_Node_Str")) {
          br.getPage(downloadLink.getDownloadURL());
          continue;
        }
        break;
      }
      if (br.containsHTML("String_Node_Str"))       throw new PluginException(LinkStatus.ERROR_CAPTCHA);
    }
    forms=br.getForm(0);
    if (forms == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
    dl=BrowserAdapter.openDownload(br,downloadLink,forms);
  }
  try {
    URLConnectionAdapter con=dl.getConnection();
    if (!con.isContentDisposition()) {
      br.getPage(forms.getAction());
      if (br.containsHTML("String_Node_Str")) {
        con.disconnect();
        throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND,JDL.L("String_Node_Str","String_Node_Str"));
      }
 else {
        con.disconnect();
        logger.warning("String_Node_Str");
        logger.warning(br.toString());
        throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT,JDL.L("String_Node_Str","String_Node_Str"));
      }
    }
    dl.startDownload();
  }
 catch (  IOException e) {
    if (e.getCause() instanceof NullPointerException) {
      throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,JDL.L("String_Node_Str","String_Node_Str"),10 * 60 * 1000l);
    }
  }
}

Fixed version (ground truth):
public void handleFree(DownloadLink downloadLink) throws Exception {
  requestFileInformation(downloadLink);
  Form forms=null;
  String directLink=br.getRegex("String_Node_Str").getMatch(0);
  if (directLink != null) {
    dl=BrowserAdapter.openDownload(br,downloadLink,directLink);
  }
 else {
    String formact=downloadLink.getDownloadURL();
    if (br.containsHTML("String_Node_Str")) {
      for (int i=0; i <= 5; i++) {
        File captchaFile=getLocalCaptchaFile("String_Node_Str");
        String captchaFileURL=br.getRegex("String_Node_Str").getMatch(0);
        String filecid=br.getRegex("String_Node_Str").getMatch(0);
        Browser.download(captchaFile,br.openGetConnection("String_Node_Str" + captchaFileURL));
        String capTxt=getCaptchaCode(captchaFile,downloadLink);
        br.postPage(formact,"String_Node_Str" + capTxt + "String_Node_Str"+ Encoding.urlEncode(filecid)+ "String_Node_Str");
        if (br.containsHTML("String_Node_Str")) {
          br.getPage(downloadLink.getDownloadURL());
          continue;
        }
        break;
      }
      if (br.containsHTML("String_Node_Str"))       throw new PluginException(LinkStatus.ERROR_CAPTCHA);
    }
    forms=br.getForm(0);
    if (forms == null)     throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT);
    dl=BrowserAdapter.openDownload(br,downloadLink,forms);
  }
  try {
    URLConnectionAdapter con=dl.getConnection();
    if (con.getContentType().contains("String_Node_Str")) {
      br.getPage(forms.getAction());
      if (br.containsHTML("String_Node_Str")) {
        con.disconnect();
        throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND,JDL.L("String_Node_Str","String_Node_Str"));
      }
 else {
        con.disconnect();
        logger.warning("String_Node_Str");
        logger.warning(br.toString());
        throw new PluginException(LinkStatus.ERROR_PLUGIN_DEFECT,JDL.L("String_Node_Str","String_Node_Str"));
      }
    }
    dl.startDownload();
  }
 catch (  IOException e) {
    if (e.getCause() instanceof NullPointerException) {
      throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,JDL.L("String_Node_Str","String_Node_Str"),10 * 60 * 1000l);
    }
  }
}