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[SOLVED] [1.19.3] ItemStackHandler/Capability/Menu Inventory Problem


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I need to put an item in a menu cell.
I use something like this.

itemstack.getCapability(ForgeCapabilities.ITEM_HANDLER, null).ifPresent(capability -> {
        if(entity instanceof Player player){
		for(int i = 0; i < inventory.getContainerSize(); ++i) {
            itemStack = inventory.getItem(i);




The problem is that the item is duplicated without removeItem. And with it, the object turns into AIR and does not work.
I have a menu, dragging to the slot works fine.

I'm sure I'm doing something wrong, can you please advise?

ICapability class

public class GunShot_Capability implements ICapabilitySerializable<CompoundTag> {
    public static void onItemDropped(ItemTossEvent event) {
        if (event.getEntity().getItem().getItem() == ForgeModItems.AK47.get()) {
            if (Minecraft.getInstance().screen instanceof Gun_Screen) {

    private final LazyOptional<ItemStackHandler> inventory = LazyOptional.of(this::createItemHandler);

    public <T> LazyOptional<T> getCapability(@Nonnull Capability<T> capability, @Nullable Direction side) {
        return capability == ForgeCapabilities.ITEM_HANDLER ? this.inventory.cast() : LazyOptional.empty();

    public CompoundTag serializeNBT() {
        return getItemHandler().serializeNBT();

    public void deserializeNBT(CompoundTag nbt) {

    private ItemStackHandler createItemHandler() {
        return new ItemStackHandler(9) {
            public int getSlotLimit(int slot) {
                return 64;

            public boolean isItemValid(int slot, @Nonnull ItemStack stack) {
                return stack.getItem() != ForgeModItems.AK47.get();

            public void setSize(int size) {

    private ItemStackHandler getItemHandler() {
        return inventory.orElseThrow(RuntimeException::new);



(I can provide a class menu if needed)

Edited by Luckydel
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  • Luckydel changed the title to [SOLVED] [1.19.3] ItemStackHandler/Capability/Menu Inventory Problem

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