MongoClient client = new MongoClient();
		DB db = client.getDB("school");
		DBCollection collection = db.getCollection("students");
		BasicDBList list = new BasicDBList();
		list.add(new BasicDBObject("$elemMatch",
				new BasicDBObject("type", "homework")));
		BasicDBObject query = new BasicDBObject("scores", new BasicDBObject(
				"$all", list));
		System.out.println(query);
		DBObject cursor = collection.findOne(new BasicDBObject(), query);
		System.out.println(cursor);