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[1.14.4][SOLVED] problem adding slots to blocks inventory


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I'm trying to create a block with a 16 slot inventory. I have no trouble adding one slot using mcjty's tutorial, but after that I get all kinds of problems.


on line 39 I try to add another slot. if I set the index to 0, it simply mirrors the first slot. it has the same item in it. if I use any number other than 0 for the index, for example 4, I get: java.lang.RuntimeException: Slot 4 not in valid range - [0,1)


package com.Garrett.backtobasics.blocks;

import net.minecraft.entity.player.PlayerEntity;
import net.minecraft.entity.player.PlayerInventory;
import net.minecraft.inventory.container.Container;
import net.minecraft.inventory.container.Slot;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.IWorldPosCallable;
import net.minecraft.util.math.BlockPos;
import net.minecraft.world.World;
import net.minecraftforge.items.CapabilityItemHandler;
import net.minecraftforge.items.IItemHandler;
import net.minecraftforge.items.SlotItemHandler;
import net.minecraftforge.items.wrapper.InvWrapper;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;

import static com.Garrett.backtobasics.blocks.ModBlocks.STORE_CONTAINER;

import javax.annotation.Nonnull;

public class StoreContainer extends Container {

    private TileEntity tileEntity;
    private PlayerEntity playerEntity;
    private IItemHandler playerInventory;
    private static final Logger LOGGER = LogManager.getLogger();

    public StoreContainer(int windowId, World world, BlockPos pos, PlayerInventory PlayerInventory, PlayerEntity player) {

        super(STORE_CONTAINER, windowId);
        tileEntity = world.getTileEntity(pos);
        this.playerEntity = player;
        this.playerInventory = new InvWrapper(PlayerInventory);

        tileEntity.getCapability(CapabilityItemHandler.ITEM_HANDLER_CAPABILITY).ifPresent(h -> {
            addSlot(new SlotItemHandler(h, 0, 8, 23));
            addSlot(new SlotItemHandler(h, 1, 26, 23));
        layoutPlayerInventorySlots(20, 138);

    public boolean canInteractWith(PlayerEntity playerIn) {
        return isWithinUsableDistance(IWorldPosCallable.of(tileEntity.getWorld(), tileEntity.getPos()), playerEntity, ModBlocks.STORE);

    private int addSlotRange(IItemHandler handler, int index, int x, int y, int amount, int dx) {
        for (int i = 0 ; i < amount ; i++) {
            addSlot(new SlotItemHandler(handler, index, x, y));
            x += dx;
        return index;

    private int addSlotBox(IItemHandler handler, int index, int x, int y, int horAmount, int dx, int verAmount, int dy) {
        for (int j = 0 ; j < verAmount ; j++) {
            index = addSlotRange(handler, index, x, y, horAmount, dx);
            y += dy;
        return index;

    private void layoutPlayerInventorySlots(int leftCol, int topRow) {
        // Player inventory
        addSlotBox(playerInventory, 25, leftCol, topRow, 9, 18, 3, 18);

        // Hotbar
        topRow += 58;
        addSlotRange(playerInventory, 16, leftCol, topRow, 9, 18);

     * Handle when the stack in slot is shift-clicked. Normally this moves the stack between the player
     * inventory and the other inventory(s).
     * copied from ChestContainer#transferStackInSlot
    public ItemStack transferStackInSlot(PlayerEntity playerIn, int index) {
        ItemStack itemstack = ItemStack.EMPTY;
        Slot slot = this.inventorySlots.get(index);
        if (slot != null && slot.getHasStack()) {
            ItemStack itemstack1 = slot.getStack();
            itemstack = itemstack1.copy();
            if (index == 0) {
                if (!this.mergeItemStack(itemstack1, 1, this.inventorySlots.size(), true)) {
                    return ItemStack.EMPTY;
            } else if (!this.mergeItemStack(itemstack1, 0, 1, false)) {
                return ItemStack.EMPTY;

            if (itemstack1.isEmpty()) {
            } else {
        return itemstack;
    private void createSlotGrid(IItemHandler h, int columns, int rows, int startIndex, int startX, int startY) {

        for (int i = 0; i < columns; i++) {
            for (int j = 0; j < rows; j++) {




the problem was that I was working with a block that was placed before I changed the IItemHandler size from 1 to 16

Edited by andGarrett
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5 minutes ago, andGarrett said:

Slot 4 not in valid range - [0,1)

Does the IItemHandler in question have a size of 16? Also post the crash.


I will be posting 1.15.2 modding tutorials on this channel. If you want to be notified of it do the normal YouTube stuff like subscribing, ect.

Forge and vanilla BlockState generator.

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14 hours ago, Animefan8888 said:

Does the IItemHandler in question have a size of 16? Also post the crash.

it does. turns out the problem was that I was working with a block that was placed before I changed the iitemhandler size from 1 to 16. once I placed a new block, it worked perfectly. Thanks for the input.

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