@EventHandler
    public void onInventoryClick(InventoryClickEvent event) {
        Inventory inventory = event.getInventory();
        if (!(inventory.getTitle().contains("Inventory")))
            return;
        if (!(event.getWhoClicked() instanceof Player))
            return;
        ItemStack item = event.getCurrentItem();
        Player player = (Player) event.getWhoClicked();
        if (item.getType().equals(Material.BOOK_AND_QUILL) && item.getItemMeta().getDisplayName().contains("Button")) {
            player.sendMessage("Message");
            player.closeInventory();
        }
        event.setCancelled(true);
    }