public GUIManager guiManager;
  
    @Override
    public void onEnable() {
      guiManager = new GUIManager(this);
    }

        GUIBuilder builder = new GUIBuilder(27, "My new GUI");
        builder.addItem(14, new ItemBuilder(Material.NETHER_STAR).setDisplayName("§eClick me!").build(), (player, itemStack) -> {
            player.sendMessage("§aYou clicked the " + itemStack.getType() + "!");
        });
        builder.addCloseAction((player, inventory) -> {
            player.sendMessage("§cYou closed the Inventory!");
        });
        builder.animate(p, GUIManager.createDefaultAnimationConfiguration());

To animate the Inventory use GUIBuilder#animate. To open the Inventory without an animation use Player#openInventory(GUIBuilder#build)

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