[JAVA] Convert Serializable Object to byte []

	public static byte[] toBytes(Serializable obj) {
		try {
			ByteArrayOutputStream baos = new ByteArrayOutputStream();
			ObjectOutputStream oos = new ObjectOutputStream(baos);
			oos.writeObject(obj);
			byte[] data = baos.toByteArray();
			return data;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

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