The command class

package com.razorblade.ultimatumgems;

import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import com.razorblade.ultimatumgems.Recipes;
import org.bukkit.inventory.PlayerInventory;

public class givegems implements CommandExecutor {
    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        if (sender instanceof Player) {
            Player player = (Player) sender;
            PlayerInventory playerInv = player.getInventory();

            playerInv.addItem(Recipes);

        }


        return false;
    }
}