Opa

@EventHandler
	public void colocarBloco(BlockPlaceEvent e) {
		Player p = e.getPlayer();
		ItemStack is = p.getInventory().getItemInHand();
		ItemMeta im = is.getItemMeta();
		Block b = e.getBlockPlaced();
		Material c = Material.CHEST;
		if (im.getDisplayName().equalsIgnoreCase("Mochila")) {
			if (b.getType() == c) {
				e.setCancelled(true);
			}
		}
	}