InventoryHolderExample

package me.gepron1x.advancedcustomitems.crafting;

import me.gepron1x.advancedcustomitems.items.CustomMaterial;
import org.bukkit.Bukkit;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.inventory.InventoryClickEvent;
import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.InventoryHolder;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;

public class CraftingBenchGUI implements InventoryHolder {
    private static final byte matrixSize = 0;
    private static byte[][] matrixCoords = new byte[][] {{10, 11, 12}, {19, 20, 21}, {28, 29, 30}};

    private Inventory handle;
    public CraftingBenchGUI() {
        handle = Bukkit.createInventory(this,6 * 9,"Верстак");
    }
    @Override
    public Inventory getInventory() {
        return handle;
    }
    public void open(Player p) {
        p.openInventory(handle);
    }
    private static ItemStack filler() {
        ItemStack item = new ItemStack(Material.BLACK_STAINED_GLASS_PANE);
        ItemMeta meta = item.getItemMeta();
        meta.setDisplayName("");
        item.setItemMeta(meta);
        return item;
    }
    public void onUse(InventoryClickEvent e) {
            CustomMaterial[][] matrix = getMatrix();
            for(Recipe recipe : Recipe.getRecipes()) {
                if(recipe.getMatrix().equals(matrix)) {
                    ((Player) e.getWhoClicked()).getInventory().addItem(new ItemStack(Material.IRON_SWORD));
                }
            }

    }
    private CustomMaterial[][] getMatrix() {
        CustomMaterial[][] rs = new CustomMaterial[3][3];
        for(int i = 0; i < matrixCoords.length; i++) {
            for(int j = 0; j < matrixCoords[i].length; j++) {
                rs[i][j] = CustomMaterial.of(handle.getItem((int) matrixCoords[i][j]));
            }
        }
        return rs;
    }

}

Listener

package me.gepron1x.advancedcustomitems.crafting;

import me.gepron1x.advancedcustomitems.AdvancedCustomItems;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.inventory.InventoryClickEvent;

public class CraftListener implements Listener {
    public CraftListener(AdvancedCustomItems plugin) {
        plugin.getServer().getPluginManager().registerEvents(this, plugin);
    }
    @EventHandler
    public void onInventoryClick(InventoryClickEvent e) {
        if(e.getClickedInventory().getHolder() instanceof CraftingBenchGUI) {
            CraftingBenchGUI craftingBench = (CraftingBenchGUI) e.getClickedInventory().getHolder();
            craftingBench.onUse(e);
        }
    }

}