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Problem with upgrading Inventory


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I have a little problem with my Inventory. I want to make it upgradeble so you can have more Slots in it. So I addet an Integer in the TileEntiy for the number of Slots and changed the size of the LazyOptional<ItemStackHandler> inventory and it seems to work, but the screen is a bit buggy. The bigger inventory occupies slots from the playerinventory and does not extend its own one, althouge I adjust the number of slots via the Integer in the tileEntity. Any idea what I am doing wrong? 


My Function to increase size in the TileEntity:

	public void setItemSlots(int itemSlots) {
		this.itemSlots = itemSlots;
		LazyOptional<ItemStackHandler> itemHandler = LazyOptional.of(() -> new ItemStackHandler(itemSlots));
		inventory.ifPresent(consumer -> {
			for (int i = 0; i < consumer.getSlots(); i++) {
				int slot = i;
				itemHandler.ifPresent(consumer1 -> consumer1.setStackInSlot(slot, consumer.getStackInSlot(slot)));
		inventory = itemHandler;	



The init of the Container. Maybe I need to re-init it, but I dont know how

	public void init() {
		tileEntity.getInventory().ifPresent(handler -> addSlots(handler, 0 , 8, 25, tileEntity.getItemSlots()));
		addPlayerInventory(8, 113);	


The addSlots Functions:

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

	public int addSlots(IItemHandler handler, int index, int x, int y, int amount) {
		int verticalAmount = (int) Math.ceil(amount/9);
		for (int i = 0; i < verticalAmount; i++) {			
			index = addHorizontalSlots(handler,index,x,y,9);
		index = addHorizontalSlots(handler, index, x, y, amount%9);
		return index;


My render in screen:

	public void render(int mouseX, int mouseY, float partialTicks) {
		// TODO Auto-generated method stub
		super.render(mouseX, mouseY, partialTicks);
		renderHoveredToolTip(mouseX, mouseY);
		getHoverdVillager(mouseX, mouseY);












Edited by Anubis
Couldn't find insert code last time
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Maybe thats an stupid question, but how do i synchronize that?

That's my NetworkHooks for the tileentity:

NetworkHooks.openGui((ServerPlayerEntity) playerEntity, village_Center_Tile_Entity, blockPos);

What do I need to add, so it will synchronize?

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  • 2 weeks later...

I don't know if anyone is interested, but I found my mistake. After long searching I found the problem, just a stupid one. Before the upgrading procedure I had a isRemote check, witch cases the unsync between client and server side.


Thanks for help everyone

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