如何在Spigot 1.16.5中创建自定义项？

import org.bukkit.Material;
import org.bukkit.NamespacedKey;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.ShapedRecipe;
import org.bukkit.plugin.java.JavaPlugin;

public class CustomItemPlugin extends JavaPlugin {

    @Override
    public void onEnable() {
        // 创建自定义项
        ItemStack customItem = new ItemStack(Material.DIAMOND_SWORD);
        customItem.getItemMeta().setDisplayName("Custom Sword");
        customItem.getItemMeta().setLore(Arrays.asList("This is a custom sword"));

        // 创建配方
        NamespacedKey key = new NamespacedKey(this, "custom_sword");
        ShapedRecipe recipe = new ShapedRecipe(key, customItem);
        recipe.shape(" D ", " D ", " S ");
        recipe.setIngredient('D', Material.DIAMOND);
        recipe.setIngredient('S', Material.STICK);

        // 注册配方
        getServer().addRecipe(recipe);
    }

    @Override
    public void onDisable() {
        // 取消注册自定义项
        // ...
    }
}