public static void doStuff2(Player player) throws IOException {
        // serialize
        StringWriter sink = new StringWriter();
        GsonConfigurationLoader loader = GsonConfigurationLoader.builder().setSink(() -> new BufferedWriter(sink)).build();

        DataView container = player.getItemInHand(HandTypes.MAIN_HAND).get().toContainer();
        loader.save(DataTranslators.CONFIGURATION_NODE.translate(container));

        // debug
        String data = sink.toString();
        System.out.println(data);

        // deserialize
        StringReader source = new StringReader(data);
        GsonConfigurationLoader loader2 = GsonConfigurationLoader.builder().setSource(() -> new BufferedReader(source)).build();
        ConfigurationNode node = loader2.load();

        DataView container2 = DataTranslators.CONFIGURATION_NODE.translate(node);
        ItemStack itemStack = Sponge.getDataManager().deserialize(ItemStack.class, container2).get();

        player.getInventory().offer(itemStack);
    }