ItemStack Serializer

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.inventory.ItemStack;

import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class ItemSerializer {
    private Class<?> craftItemStack;
    private Class<?> mojangsonParser;
    private Class<?> nmsItemStack;

    public ItemSerializer() {
        try {
            String version = Bukkit.getServer().getClass().getPackage().getName().split("\\.")[3];

            craftItemStack = Class
                    .forName("org.bukkit.craftbukkit.{v}.inventory.CraftItemStack".replace("{v}", version));

            mojangsonParser = Class.forName("net.minecraft.server.{v}.MojangsonParser".replace("{v}", version));

            nmsItemStack = Class.forName("net.minecraft.server.{v}.ItemStack".replace("{v}", version));

        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }

    }

    private Object nmsItem(ItemStack item) throws IllegalAccessException, IllegalArgumentException,
            InvocationTargetException, NoSuchMethodException, SecurityException {

        Method asNms = craftItemStack.getMethod("asNMSCopy", ItemStack.class);
        asNms.setAccessible(true);
        Object nmsItem = asNms.invoke(craftItemStack, item);
        return nmsItem;

    }

    public String serialize(ItemStack item) {
        JsonObject itemJson = new JsonObject();
        itemJson.addProperty("id", item.getType().getKey().toString());
        itemJson.addProperty("Count", item.getAmount());
        itemJson.add("tag", (JsonElement) new JsonParser().parse(getNBT(item)));
        return itemJson.toString();
    }

    public ItemStack deserialize(String json) {
        try {
            JsonObject itemJson = (JsonObject) new JsonParser().parse(json);
            Material mat = Material.matchMaterial(itemJson.get("id").getAsString());
            int count = itemJson.get("Count").getAsInt();

            ItemStack item = new ItemStack(mat, count);
            Object nmsItem = nmsItem(item);

            Method parseNBT = mojangsonParser.getMethod("parse", String.class);
            Object nbtCompound = parseNBT.invoke(mojangsonParser, itemJson.get("tag").getAsString()); // Turns NBT
                                                                                                        // string into
                                                                                                        // NBTTagCompound

            Method setTag = nmsItemStack.getMethod("setTag", nbtCompound.getClass());
            setTag.invoke(nmsItem, nbtCompound);

            Method asBukkitCopy = craftItemStack.getMethod("asBukkitCopy", nmsItemStack);
            ItemStack editedItem = (ItemStack) asBukkitCopy.invoke(craftItemStack, nmsItem);
            return editedItem;

        } catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException
                | InvocationTargetException e) {
            e.printStackTrace();
        }
        return new ItemStack(Material.AIR);

    }

    private String getNBT(ItemStack item) {

        try {
            Object nmsItem = nmsItem(item);
            if (nmsItem == null) {
                throw new IllegalArgumentException(item.getType().name() + " could not be queried!");
            }
            Method hasTag = nmsItem.getClass().getMethod("hasTag");

            if ((boolean) hasTag.invoke(nmsItem)) {
                Method getTag = nmsItem.getClass().getMethod("getTag");
                Object nbtData = getTag.invoke(nmsItem);
                Method asString = nbtData.getClass().getMethod("asString");
                return (String) asString.invoke(nbtData);
            }

        } catch (IllegalArgumentException | NoSuchMethodException | SecurityException | IllegalAccessException
                | InvocationTargetException e) {
            e.printStackTrace();
        }
        return "{}";

    }

}