java - Google ドライブから大きなファイルを gae blobstore に読み込む方法

Question

これは、Google ドライブから Google アプリ エンジンのブロブストアにファイルを読み込むために現在使用しているコードです。

private BlobKey getBlobKey(File f, DriveObject driveObject)
            throws IOException, MalformedURLException { 

        Drive service = ((GoogleDrive) driveObject).getService();

        byte[] buffer = new byte[(int) f.getFileSize().intValue()];
        GenericUrl url = new GenericUrl(f.getDownloadUrl());
        HttpResponse response = service.getRequestFactory()
                    .buildGetRequest(url).execute();

        InputStream is = response.getContent();

        FileService fileService = FileServiceFactory.getFileService();
        AppEngineFile file = null;
        boolean lock = true;
        try {
            file = fileService.createNewBlobFile("application/zip");
            FileWriteChannel writeChannel = fileService.openWriteChannel(
                        file, lock);

            int len;
            while ((len = is.read(buffer)) >= 0) {
            ByteBuffer bb = ByteBuffer.wrap(buffer, 0, len);
            writeChannel.write(bb);
            }
            writeChannel.closeFinally();

        } catch (IOException e) {
                // TODO Auto-generated catch block
            e.printStackTrace();
        }

            BlobKey bk = fileService.getBlobKey(file);

        return bk;
    }

これは小さなファイルには問題なく機能しますが、ファイルが ~25MB を超えるとエラーが発生します。私がやろうとしていることを行うためのより良い方法はありますか?

これは私が見るエラーです

Uncaught exception from servlet
com.google.appengine.api.urlfetch.ResponseTooLargeException: The response from url https://doc-0o-bs-docs.googleusercontent.com/docs/securesc/97o44sjeam7f23b1flie9m3qqidhrago/97q4akk8bmpub24itqhclo1vakjusu84/1368259200000/14350098165097390874/14350098165097390874/0ByS2XCxCEzq-NUVuajAwWGVoR1U?h=16653014193614665626&e=download&gd=true was too large.
    at com.google.appengine.api.urlfetch.URLFetchServiceImpl.convertApplicationException(URLFetchServiceImpl.java:132)
    at com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:43)
    at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.fetchResponse(URLFetchServiceStreamHandler.java:417)
    at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getInputStream(URLFetchServiceStreamHandler.java:296)
    at com.google.apphosting.utils.security.urlfetch.URLFetchServiceStreamHandler$Connection.getResponseCode(URLFetchServiceStreamHandler.java:149)
    at com.google.api.client.http.javanet.NetHttpResponse.<init>(NetHttpResponse.java:37)
    at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:95)
    at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:980)

私はそれを追加する必要があります

Drive service = ((GoogleDrive) driveObject).getService();

戻り値

new Drive.Builder(httpTransport, jsonFactory, cred)
            .build()