Program: 21365
Project: 21365
Buggy source:
private String EinzelLinks(String url){
  String links="String_Node_Str";
  boolean fileDownloaded=false;
  if (!url.startsWith("String_Node_Str"))   url="String_Node_Str" + url;
  try {
    url=url.replaceAll("String_Node_Str","String_Node_Str");
    url=url.replaceAll("String_Node_Str","String_Node_Str");
    RequestInfo reqinfo=getRequest(new URL(url));
    String cookie=reqinfo.getCookie();
    File captchaFile=null;
    String capTxt=null;
    while (true) {
      Matcher matcher=patternCaptcha.matcher(reqinfo.getHtmlCode());
      if (matcher.find()) {
        if (captchaFile != null && capTxt != null) {
          JDUtilities.appendInfoToFilename(captchaFile,capTxt,false);
        }
        String captchaAdress="String_Node_Str" + matcher.group(2);
        captchaFile=getLocalCaptchaFile(this,"String_Node_Str");
        fileDownloaded=JDUtilities.download(captchaFile,getRequestWithoutHtmlCode(new URL(captchaAdress),cookie,null,true).getConnection());
        if (!fileDownloaded || !captchaFile.exists() || captchaFile.length() == 0) {
          logger.severe("String_Node_Str");
          try {
            Thread.sleep(1000);
            reqinfo=getRequest(new URL(url));
            cookie=reqinfo.getCookie();
          }
 catch (          InterruptedException e) {
          }
          continue;
        }
        capTxt=JDUtilities.getCaptcha(this,"String_Node_Str",captchaFile,false);
        reqinfo=postRequest(new URL(url),"String_Node_Str" + matcher.group(1) + "String_Node_Str"+ capTxt+ "String_Node_Str");
      }
 else {
        if (captchaFile != null && capTxt != null) {
          JDUtilities.appendInfoToFilename(captchaFile,capTxt,true);
        }
        break;
      }
    }
    links=reqinfo.getLocation();
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
  return links;
}

Fixed version (ground truth):
private String EinzelLinks(String url){
  String links="String_Node_Str";
  boolean fileDownloaded=false;
  if (!url.startsWith("String_Node_Str"))   url="String_Node_Str" + url;
  try {
    url=url.replaceAll("String_Node_Str","String_Node_Str");
    url=url.replaceAll("String_Node_Str","String_Node_Str");
    RequestInfo reqinfo=getRequest(new URL(url));
    reqinfo.setHtmlCode(reqinfo.getHtmlCode().replaceAll("String_Node_Str","String_Node_Str").replaceAll("String_Node_Str","String_Node_Str"));
    String cookie=reqinfo.getCookie();
    File captchaFile=null;
    String capTxt=null;
    while (true) {
      Matcher matcher=patternCaptcha.matcher(reqinfo.getHtmlCode());
      if (matcher.find()) {
        if (captchaFile != null && capTxt != null) {
          JDUtilities.appendInfoToFilename(captchaFile,capTxt,false);
        }
        String captchaAdress="String_Node_Str" + matcher.group(2);
        captchaFile=getLocalCaptchaFile(this,"String_Node_Str");
        fileDownloaded=JDUtilities.download(captchaFile,getRequestWithoutHtmlCode(new URL(captchaAdress),cookie,null,true).getConnection());
        if (!fileDownloaded || !captchaFile.exists() || captchaFile.length() == 0) {
          logger.severe("String_Node_Str");
          try {
            Thread.sleep(1000);
            reqinfo=getRequest(new URL(url));
            reqinfo.setHtmlCode(reqinfo.getHtmlCode().replaceAll("String_Node_Str","String_Node_Str").replaceAll("String_Node_Str","String_Node_Str"));
            cookie=reqinfo.getCookie();
          }
 catch (          InterruptedException e) {
          }
          continue;
        }
        capTxt=JDUtilities.getCaptcha(this,"String_Node_Str",captchaFile,false);
        reqinfo=postRequest(new URL(url),"String_Node_Str" + matcher.group(1) + "String_Node_Str"+ capTxt+ "String_Node_Str");
      }
 else {
        if (captchaFile != null && capTxt != null) {
          JDUtilities.appendInfoToFilename(captchaFile,capTxt,true);
        }
        break;
      }
    }
    links=reqinfo.getLocation();
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
  return links;
}