@Override
    public BlobResource persist(BlobResource entity) throws Exception {
        BlobResource result = null;
        if (entity != null){
            logger.info("Bytes to write: " + entity.getBytes().length);
            logger.info("Mime type:  " + entity.getMimeType());
            if (entity.getBytes() != null){
                try {
                    FileService fileService = FileServiceFactory.getFileService();
                    AppEngineFile file = fileService.createNewBlobFile(entity.getMimeType());
                    String path = file.getFullPath();
                    file = new AppEngineFile(path);
                    boolean lock = true;
                    FileWriteChannel writeChannel = fileService.openWriteChannel(file, lock);
                    // This time we write to the channel directly
                    writeChannel.write(ByteBuffer.wrap(entity.getBytes()));
                    writeChannel.closeFinally();
                    BlobKey blobKey = fileService.getBlobKey(file);
                    if (blobKey != null){ // Blob is assumed to be written already
                        entity.setBlobKey(blobKey.getKeyString());
                        Key<BlobResource> key = put(entity);
                        try {
                            result = get(key);
                        } catch (Exception e) {
                            throw new BlobResourceException("Error persisting entity");
                        }
                    }
                    logger.info("Blob Key: " + blobKey.getKeyString());
                } catch (Exception e) {
                    e.printStackTrace();
                    throw new BlobResourceException();
                }
            } else {
                throw new NullValueException();
            }
        } else {
            throw new BlobResourceException();
        }
        return result;
    }