Filling Chest Inventory

So first of all, Hi I hope you're in an alright mood to have to deal with me right now haha just a small problem that I can't manage to fix myself.

So I'm trying to fill all the chest in the world with items that are loaded when the server begins:

Code:

        for (Chunk c : w.getLoadedChunks()) {
            for (BlockState b : c.getTileEntities()) {
                if (b instanceof Chest) {
                    Chest chest = (Chest) b;
                    Inventory inv = chest.getInventory();
                    inv.clear();
                    int items = r.nextInt(4) + 1;
                    int index = 0;
                    do {
                        inv.setItem(r.nextInt(36), presets.get(r.nextInt(presets.size())));
                    }while (index <= items);
                }
            }
        }

But Whenever I do setItem I get an error when the method is call:

Code:

[16:23:22] [Server thread/ERROR]: Could not pass event PlayerInteractEvent to RefillMev1.0
Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

If I do inv.addItem() Somehow it works fine but I want the random layout of the Chest Inventory. By Chance is there anything you can see that I'm doing wrong here? It would be greatly appreciated!

 

Code:

                    do {
                        inv.setItem(r.nextInt(36), presets.get(r.nextInt(presets.size())));
                    }while (index <= items);

Τhis is the cause most likely.

presets may be empty, check this before or change the loop from do while to while (with some tweaks)

 

@mine-care

That's not the problem I'm definitely sure. Presets is never empty beacause the ArrayList is always attempted to be filled before.

Code:

//Right before the above method i do
loadItems();

and this method looks like this:

public void loadItems(){
        if(presets.isEmpty()){
            presets.add(new ItemStack(Material.STONE_SWORD));
            presets.add(new ItemStack(Material.WOOD_SWORD));
            presets.add(new ItemStack(Material.IRON_AXE));
            presets.add(new ItemStack(Material.FEATHER));
            presets.add(new ItemStack(Material.FLINT));
        }
    }

 

Normal chests have 27 slots. Double chests have 54 slots

 

@FisheyLP :O I have no idea why I thought it was 36 haha I'll get back to you with an update thanks for the point!

 

@ShadowWizardMC by the way instead of 36 you should be able to get the size of the Inventory