Help With Chest Filling

I am making an SG based plugin and need some help with filling the chests.
This is the code i have tried:

Code:

        int radius = 100;
        Location loc = new Location(Bukkit.getServer().getWorld("purge"), 12, 120, 12);
        World world = loc.getWorld();
        for (int x = -radius; x < radius; x++) {
            for (int y = -radius; y < radius; y++) {
                for (int z = -radius; z < radius; z++) {
                    Block block = world.getBlockAt(loc.getBlockX()+x, loc.getBlockY()+y, loc.getBlockZ()+z);
                    if (block.getType() == Material.CHEST) {
                        Chest chest = (Chest) block;
                        Material[] items = new Material[] { Material.GOLDEN_APPLE, Material.IRON_CHESTPLATE, Material.STONE_SWORD };
                        Random r = new Random();
                        int numItems = r.nextInt(5) + 1;        for (int i = 0; i < numItems; i++) {
                            Material material = items[r.nextInt(items.length)];
                            ItemStack item = new ItemStack(material, 1);
                            int index;

                            do {
                                index = r.nextInt(chest.getInventory().getSize());
                            } while (chest.getInventory().getItem(index) != null);

                            chest.getInventory().setItem(index, item);
                        }

                    }
                }
            }
        }

 

@dlange Don't just cast the chest to the block, cast it to the blockState (block.getBlockState()) - BlockStates carry extra information about blocks, such as the contents of a chest or the information stored on a sign.

 

Example please?

omg ty soo much <3 it worked

@DJSkepter Do you know a way I can make a percentage system/rarities system for items in the chests?