Bukkit Spigot Kits

package test;

import java.io.ByteArrayInputStream;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.util.io.BukkitObjectInputStream;
import org.bukkit.util.io.BukkitObjectOutputStream;
import org.yaml.snakeyaml.external.biz.base64Coder.Base64Coder;

import net.minecraft.util.org.apache.commons.io.output.ByteArrayOutputStream;

public class Main4 extends JavaPlugin {

    public static String itemStackArrayToBase64(ItemStack[] items) {
        try {
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
            BukkitObjectOutputStream dataOutput = new BukkitObjectOutputStream(outputStream);
            dataOutput.writeInt(items.length);
            for (int i=0; i<items.length; i++) {
                dataOutput.writeObject(items[i]);
            }
            dataOutput.close();
            return Base64Coder.encodeLines(outputStream.toByteArray());
        } catch (Exception e) {
            return null;
        }
    }

    public static ItemStack[] itemStackArrayFromBase64(String data) {
        try {
            ByteArrayInputStream inputStream = new ByteArrayInputStream(Base64Coder.decodeLines(data));
            BukkitObjectInputStream dataInput = new BukkitObjectInputStream(inputStream);
            ItemStack[] items = new ItemStack[dataInput.readInt()];
            for (int i=0; i<items.length; i++) {
                items[i] = (ItemStack) dataInput.readObject();
            }
            dataInput.close();
            return items;
        } catch (Exception e) {
            return null;
        }
    }

    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

        if(sender instanceof Player) {

            Player player = (Player) sender;

            if(label.equalsIgnoreCase("save")) {
                String armor = itemStackArrayToBase64(player.getInventory().getArmorContents());
                String inv = itemStackArrayToBase64(player.getInventory().getContents());
                getConfig().set("Kit.Armor", armor);
                getConfig().set("Kit.Inventory", inv);
                saveConfig();
                player.sendMessage(ChatColor.GREEN + "Kit saved!");
            }

            if(label.equalsIgnoreCase("load")) {
                if(getConfig().contains("Kit.Armor") && getConfig().contains("Kit.Inventory")) {
                    String armor = getConfig().getString("Kit.Armor");
                    String inv = getConfig().getString("Kit.Inventory");
                    player.getInventory().setArmorContents(itemStackArrayFromBase64(armor));
                    player.getInventory().setContents(itemStackArrayFromBase64(inv));
                    player.sendMessage(ChatColor.GREEN + "Kit loaded!");
                } else {
                    player.sendMessage(ChatColor.RED + "Kit is not saved!");
                }
            }
        }

        return true;
    }

}