[Demonstration 1]

[Buggy Method]
public Imagen guardarImagen(String serverAbsolutePath, String username, String fileName, byte[] bytes) {
    try {
        String userDirPath = serverAbsolutePath + username;
        File dir = new File(userDirPath);
        dir.mkdir();
        String fileNameConPath = userDirPath + "/" + fileName;
        File f = new File(fileNameConPath);
        f.setWritable(true);
        FileOutputStream fos = new FileOutputStream(f);
        fos.write(bytes);
        fos.flush();
        fos.close();
        Imagen imagen = new Imagen();
        String imageFilePath = serverRelativePath + username + "/" + fileName;
        imagen.setPath(imageFilePath);
        imagen.setAbsolutePath(fileNameConPath);
        imagen.setNombre(fileName);
        return imagen;
    } catch (Exception e) {
        throw new RuntimeException(e.getMessage());
    }
}

[Buggy Hunk]
String userDirPath=serverAbsolutePath+username;

[Patch]
String userDirPath=serverAbsolutePath+"usuarios/"+username;

[Demonstration 2]

[Buggy Method]
@Override
protected void onResume() {
    super.onResume();
    Log.e("Camera Status", "resume called");
    if (isConnected) {
        mCamera = null;
        Log.e("is connected ", "true");
        Intent i = new Intent(this, backgroundservice.class);
        this.stopService(i);
        this.unbindService(mServerConn);
        //-----
        serviceResult = false;
        try {
            Thread thread = new CameraIntializer();
            thread.start();
            synchronized (thread) {
                thread.wait(1000);
            }
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        this.finish();
    }
    if (serviceResult) {
        Log.e("service result", "true");
        runThread = true;
        s.start();
    }
}

[Buggy Hunk]
Intent i = new Intent(this, backgroundservice.class);

[Patch]
Intent i = new Intent(this, BackgroundService.class);

[Demonstration 3]

[Buggy Method]
public boolean ensureExistance() {
    if (exists())
        return false;
    try {
        getParentFile().mkdirs();
        createNewFile();
    } catch (Exception exception) {
        exception.printStackTrace();
    }
    return true;
}

[Buggy Hunk]
getParentFile().mkdirs();

[Patch]
if(getParentFile()!=null)getParentFile().mkdirs();