Solved Filling a chest at know location

Hey, I can't seem to figure out this one..

I have a list of locations, and want to fill the chests inventories which are located at this locations.

So here is what I am doing (and what seems to fail silently):

Code:

void fillChests() {
        List<Location> forRemoval = new ArrayList<Location>();
        // other chests is a list of locations where I will find the chests
        for (Location loc : otherChests) {
            //getting the block at this location -> works fine
            Block block = loc.getWorld().getBlockAt(loc);
            // checking if it is a chest -> works fine
            if (block.getState() instanceof Chest) {
                // casting the block state to Chest
                Chest chest = (Chest) block.getState();
                // filling the chest with method below
                fillChest(chest.getInventory());
                // to be save: update block state
                chest.update();
                // continue with the next location
                continue;
            }
            // if a block is no chest (because someone broke it), I remove it later from the list of locations
            forRemoval.add(loc);
        }
        // removing and saving all locations which were no chests anymore
        if (!forRemoval.isEmpty()) {
            otherChests.removeAll(forRemoval);
            Config.saveCurrentConfig();
        }
       
    }
   
    // filling the chests inventory with random items from a given list of ItemStacks
    private void fillChest(Inventory inv) {
        if (inv != null && Config.items != null && !Config.items.isEmpty()) {
            // for each slot in the chest
            for (int i = 0; i < inv.getSize(); i++) {
                // put item in it, or not
                if (Utils.random.nextInt(2) == 1) {
                    // getting a random ItemStack from the list of ItemStacks
                    ItemStack is = Config.items.get(Utils.random.nextInt(Config.items.size())).clone();
                    // randomly change the amount a bit
                    is.setAmount(Utils.random.nextInt(is.getAmount()) + 1);
                    // placing the item at the slot in the inventory
                    inv.setItem(i, is);
                }
            }
        }
    }

It seems that everythign works fine, because:
* with some debug messages I found out, that it successfully fills the given inventory with some items.
* The blocks are really chests and he is able to locate them
* The code above works fine if I call it inside an IteractEvent, itneracting with the chest I want to fill. But if I want to get the chests "remotly" and filling them it fails silently = seems to still fill the chests BUT: When I check the chests, they are all empty..

Something bukkit specific I am missing here ?

Okay, I found the problem I think (finally):

I load the locations from config and store them in a list.
But my plugin unloads and loads the world these locations are referencing every once and a while resulting (I think) in a new world object being generated and the world my stored locations are referencing not being completly removed internal by java -> I can still modify blocks in this world and check block types there, but the world bukkit is referencing is a new one, with same name etc..

So everything I do with the stored locations is affecting the "old" world (before unloading/loading) while I see the new world where nothing is changing :/ So I will have to recreate the location objects everytime I reload the world..

This was a very tricky bug :/

EDIT by Moderator: merged posts, please use the edit button instead of double posting.