Help with PrepareItemCraftEvent

Discussion in 'Plugin Development' started by Atmoist, Oct 13, 2020.

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        public void onPrepareItemCraft(PrepareItemCraftEvent event) {
                CraftingInventory inv = event.getInventory();
                ItemStack[] items = inv.getMatrix();
                if (!items[1].getItemMeta().getDisplayName().equals(ItemManager.darkemerald.getItemMeta().getDisplayName())
                        || !items[2].getType().equals(Material.NETHERITE_INGOT)
                        || !items[5].getType().equals(Material.STICK)
                        || !items[8].getType().equals(Material.STICK)){
                    event.getInventory().setResult(new ItemStack(Material.AIR));
                } else {
                    event.getInventory().setResult(new ItemStack(ItemManager.scythe));
    This is the code I'm using to try and create a custom recipe using a custom item (darkemerald). I'm new to making plugins and am not really sure what I'm doing wrong. I have no errors in eclipse, when I try to add things to a crafting interface in game, however, I get an error saying org.bukkit.event.EventException: null. How can I go about fixing this? Is there a better way to to go about adding custom items to custom recipes?
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    The null is because you are assuming all those elements are in the items array, when they may not be. Also you are assuming the item in slot 1 has meta/display name when it may not.

    Lastly, the default is to not have a crafting target so there is no need to do the negative check and setting of air, just check if the ingredients are correct then set the custom item.

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