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[1.16.5] Inventory not accepting items from hopper


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Hi, I've created a new custom inventory and the inventory doesn't seem to accept items from a hopper.

I have used this as an example: https://github.com/TheGreyGhost/MinecraftByExample/tree/master/src/main/java/minecraftbyexample/mbe30_inventory_basic

I've looked at Minecraft's ChestTileEntity.java and ChestContainer.java but I still can't figure it out.



public class ExampleChestTileEntity extends TileEntity implements INamedContainerProvider {
    public static final int NUMBER_OF_SLOTS = 9;

    private final ExampleChestContents exampleChestContents;

    public ExampleChestTileEntity() {
        exampleChestContents = ExampleChestContents.createForTileEntity(NUMBER_OF_SLOTS, this::canPlayerAccessInventory, this::setChanged);
        exampleChestContents.setOpenInventoryNotificationLambda(() -> playSound(SoundEvents.CHEST_OPEN));
        exampleChestContents.setCloseInventoryNotificationLambda(() -> playSound(SoundEvents.CHEST_CLOSE));

    public boolean canPlayerAccessInventory(PlayerEntity player) {
        if (this.level.getBlockEntity(this.getBlockPos()) != this) return false; // Check if tileentity is still there
        final double X_CENTRE_OFFSET = 0.5;
        final double Y_CENTRE_OFFSET = 0.5;
        final double Z_CENTRE_OFFSET = 0.5;
        final double MAXIMUM_DISTANCE_SQ = 8.0 * 8.0;
        return player.distanceToSqr(
                getBlockPos().getX() + X_CENTRE_OFFSET,
                getBlockPos().getY() + Y_CENTRE_OFFSET,
                getBlockPos().getZ() + Z_CENTRE_OFFSET
        ) < MAXIMUM_DISTANCE_SQ; // Check if player isn't too far away

    private static final String INVENTORY_NBT = "contents";

    public CompoundNBT save(CompoundNBT parentNBTTagCompound) {
        super.save(parentNBTTagCompound); // Save position
        CompoundNBT inventoryNBT = exampleChestContents.serializeNBT();
        parentNBTTagCompound.put(INVENTORY_NBT, inventoryNBT); // Save chest contents
        return parentNBTTagCompound;

    public void load(BlockState blockState, CompoundNBT parentNBTTagCompound) {
        super.load(blockState, parentNBTTagCompound); // Load position
        CompoundNBT inventoryNBT = parentNBTTagCompound.getCompound(INVENTORY_NBT);
        exampleChestContents.deserializeNBT(inventoryNBT); // Load chest contents
        if (exampleChestContents.getContainerSize() != NUMBER_OF_SLOTS)
            throw new IllegalArgumentException("Corrupted NBT: Number of inventory slots did not match expected.");

    public SUpdateTileEntityPacket getUpdatePacket() {
        CompoundNBT nbtTagCompound = new CompoundNBT();
        int tileEntityType = 42;  // arbitrary number
        return new SUpdateTileEntityPacket(this.getBlockPos(), tileEntityType, nbtTagCompound);

    public void onDataPacket(NetworkManager net, SUpdateTileEntityPacket packet) {
        BlockState blockState = level.getBlockState(getBlockPos());
        load(blockState, packet.getTag());

    public CompoundNBT getUpdateTag() {
        CompoundNBT nbtTagCompound = new CompoundNBT();
        return nbtTagCompound;

    public void handleUpdateTag(BlockState state, CompoundNBT tag) {
        this.load(state, tag);

    public void dropAllContents(World world, BlockPos blockPos) {
        InventoryHelper.dropContents(world, blockPos, exampleChestContents);

    public ITextComponent getDisplayName() {
        return new TranslationTextComponent("container.callumsmod.example_chest");

    private void playSound(SoundEvent soundEvent) {
        double x = (double) this.worldPosition.getX() + 0.5D;
        double y = (double) this.worldPosition.getY() + 0.5D;
        double z = (double) this.worldPosition.getZ() + 0.5D;

        this.level.playSound(null, x, y, z, soundEvent, SoundCategory.BLOCKS, 0.5F, this.level.random.nextFloat() * 0.1F + 0.9F);

    public Container createMenu(int windowID, PlayerInventory playerInventory, PlayerEntity playerEntity) {
        return ExampleChestContainer.createContainerServerSide(windowID, playerInventory, exampleChestContents);



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