public class HandleModel {
    private static GridFSBucket gridFSBucket;    
    public static void putModel(Object model, String objName) throws Exception {
        String uuid = UUID.randomUUID().toString();
        ByteArrayOutputStream btos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(btos);        oos.writeObject(model);
        oos.flush();
        oos.close();
        byte[] fileContent = btos.toByteArray();
        btos.close();
        GridFSUploadOptions options =
                new GridFSUploadOptions().chunkSizeBytes(3584000).metadata(new Document("objectType", objName));
        GridFSUploadStream uploadStream = gridFSBucket.openUploadStream(uuid, options);
        uploadStream.write(fileContent);
        uploadStream.close();
    }
}