Program: 93797
Project: 93797
Buggy source:
private String downloadContainerIntoFolder(String urlPath,File resOutputDir){
  if (urlPath == null)   return null;
  if (resOutputDir == null || !resOutputDir.exists())   return null;
  if (!resOutputDir.isDirectory() || !resOutputDir.canRead() || !resOutputDir.canWrite())   return null;
  URL url;
  try {
    url=new URL(urlPath);
  }
 catch (  MalformedURLException e) {
    e.printStackTrace();
    return null;
  }
  if (!url.getProtocol().equals("String_Node_Str") && !url.getProtocol().equals("String_Node_Str"))   return null;
  int finalSeparatorIndex=url.getPath().lastIndexOf("String_Node_Str");
  String containerName=url.getFile().substring(finalSeparatorIndex);
  if (containerName == null || containerName.isEmpty())   return null;
  int extensionIndex=containerName.lastIndexOf("String_Node_Str");
  String extension=containerName.substring(extensionIndex);
  if (!extension.equals("String_Node_Str") && !extension.equals("String_Node_Str"))   return null;
  File checkFile=new File(resOutputDir.getAbsolutePath() + containerName);
  String finalContainerName;
  if (checkFile.exists()) {
    int currentIndex=0;
    do {
      currentIndex++;
      finalContainerName=containerName.substring(0,extensionIndex) + currentIndex + extension;
      checkFile=new File(resOutputDir.getAbsolutePath() + finalContainerName);
    }
 while (checkFile.exists());
  }
 else {
    finalContainerName=containerName;
  }
  String localContainerPath=resOutputDir.getAbsolutePath() + finalContainerName;
  boolean isDownloadSuccessful=FileDownloader.downloadRemoteUrl(url,localContainerPath);
  if (isDownloadSuccessful)   return localContainerPath;
  return null;
}

Fixed version (ground truth):
private String downloadContainerIntoFolder(String urlPath,File resOutputDir){
  if (urlPath == null)   return null;
  if (resOutputDir == null || !resOutputDir.exists())   return null;
  if (!resOutputDir.isDirectory() || !resOutputDir.canRead() || !resOutputDir.canWrite())   return null;
  URL url;
  try {
    url=new URL(urlPath);
  }
 catch (  MalformedURLException e) {
    e.printStackTrace();
    return null;
  }
  if (!url.getProtocol().equals("String_Node_Str") && !url.getProtocol().equals("String_Node_Str"))   return null;
  int finalSeparatorIndex=url.getPath().lastIndexOf("String_Node_Str");
  String containerName=url.getFile().substring(finalSeparatorIndex);
  if (containerName == null || containerName.isEmpty())   return null;
  int extensionIndex=containerName.lastIndexOf("String_Node_Str");
  String extension=containerName.substring(extensionIndex);
  if (!extension.equals("String_Node_Str") && !extension.equals("String_Node_Str"))   return null;
  File checkFile=new File(resOutputDir.getAbsolutePath() + containerName);
  String finalContainerName;
  if (checkFile.exists()) {
    int currentIndex=0;
    do {
      currentIndex++;
      finalContainerName=containerName.substring(0,extensionIndex) + currentIndex + extension;
      checkFile=new File(resOutputDir.getAbsolutePath() + finalContainerName);
    }
 while (checkFile.exists());
  }
 else {
    finalContainerName=containerName;
  }
  String localContainerPath=resOutputDir.getAbsolutePath() + finalContainerName;
  boolean isDownloadSuccessful=mFileDownloader.downloadRemoteUrl(url,localContainerPath);
  if (isDownloadSuccessful)   return localContainerPath;
  return null;
}