How to cast Inventories onto blocks w/ relativity

Hi everyone,
Keep getting an error that I can't cast a Chest on to my relative check. Was hoping maybe someone could help
My main goal is to add objects to an inventory if it exists in the check
Note: Firstblock is a Block, and block is a Block

Code:

   
            //*Block s = firstblock.getRelative(BlockFace.SOUTH, 1);
            Block n = firstblock.getRelative(BlockFace.NORTH, 1);
            InventoryHolder sh = (InventoryHolder) s.getState().getData();
            InventoryHolder nh = (InventoryHolder) n.getState().getData();
            Inventory sinv = sh.getInventory();
            Inventory ninv = nh.getInventory(); */
      if (player.isOnline()) {
                if (block.getType().equals(Material.MOSSY_COBBLESTONE)) {
                    block.setType(Material.COBBLE_WALL);
                    Location location = block.getLocation();
                    String playername = player.getName();
                    Bukkit.getPlayer(playername).getWorld().playSound(location, Sound.PISTON_EXTEND, 1, 0);
                    player.playEffect(block.getLocation(), Effect.SMOKE, 0);
                    mossy++;
                    pblocks++;
                    if (thisPlugin.getConfig().getString("Chests").equalsIgnoreCase("false")) {
                        player.getInventory().addItem(new ItemStack(Material.MOSSY_COBBLESTONE, 1));
                    }
                    if (thisPlugin.getConfig().getString("Chests").equalsIgnoreCase("true")) {
                        if (firstblock.getRelative(BlockFace.NORTH, 1).getType().equals(Material.CHEST) || firstblock.getRelative(BlockFace.SOUTH, 1).getType().equals(Material.CHEST)) {
                            if (s.getType().equals(Material.CHEST) && n.getType().equals(Material.CHEST)) {
                                n.setType(Material.AIR);
                                sinv.addItem(new ItemStack(Material.MOSSY_COBBLESTONE, 1));
 
                            }
                            if (s.getType().equals(Material.CHEST)) {
                                sinv.addItem(new ItemStack(Material.MOSSY_COBBLESTONE, 1));
                            }
                            if (n.getType().equals(Material.CHEST)) {
                                ninv.addItem(new ItemStack(Material.MOSSY_COBBLESTONE, 1));
                            }
                        } else {
                            player.getInventory().addItem(new ItemStack(Material.MOSSY_COBBLESTONE, 1));
                        }
                    }
                    if (thisPlugin.getConfig().getString("Quiet-Mode").equalsIgnoreCase("false")) {
                        player.sendMessage(ChatColor.DARK_GREEN + "[Drill]: Mined Mossy Cobblestone");
 
                    }
                }
            }

 

Hem, where exactly is your error? I don't see a cast to chest...
But when you use casting, always do an instanceof check, to make sure you don't get a ClassCastError.
Your cast to InventoryHolder will always throw such a ClassCastError, as far as I'm aware, because it is not the state's data that is an InventoryHolder, but the blockState itself. So you should use

Code:

            InventoryHolder sh = (InventoryHolder) s.getState();

 

Heres the error: Caused by: java.lang.ClassCastException: org.bukkit.craftbukkit.v1_4_R1.block.CraftBlockState cannot be cast to org.bukkit.inventory.InventoryHolder
at me.xsilverfalconx.Drills.EventListener$BlockReplaceRunnable.run(EventListener.java:72)
at me.xsilverfalconx.Drills.EventListener.handle(EventListener.java:499)
at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
... 16 more

 

As I said, you have to check for instanceof before casting. You should read up on what exactly is casting. Here, you're trying to interpret a blockstate as a blockstate with an inventory. If the block has an inventory, it will work, but if it doesn't, it will throw a ClassCastException. What it means is that you can't add an item to a dirt block's inventory because it has no inventory!

Think about what you really want your plugin to do : Do you want to replace the block with a chest? Do you want to add the item only if it is a chest?