GUI won't perform actions by click

I'm trying to create a pretty simple GUI. It works when I type the command "/gui", but once in the GUI, it doesn't run the command I have specified that gives back the raw slot of the item - instead, I just pick up the item with my cursor where it becomes draggable. I'm using the SpigotMC "Creating a GUI Inventory" tutorial for reference.

Here's my main class:

Code:

public final class MapsGUI extends JavaPlugin {

    @Override
    public void onEnable() {
        saveDefaultConfig();
        getServer().getPluginManager().registerEvents(new Listeners(), this);
        getServer().getPluginManager().registerEvents(new launchGUI(), this);
    }

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
        if (cmd.getName().equalsIgnoreCase("gui")) {
            if (getConfig().getBoolean("mapChosen") == true) {
                sender.sendMessage(ChatColor.RED + "Map already chosen!");
            } else {
                launchGUI gui = new launchGUI();
                gui.openInventory((HumanEntity) sender);
                return true;
            }
        }
        return false;
    }

    @Override
    public void onDisable() {
        saveConfig();
    }
}

Here's my launchGUI class:

Code:

public class launchGUI implements Listener {
    private final Inventory main;

    public launchGUI() {
        main = Bukkit.createInventory(null, 9, "Main");
        initializeItems();
    }

    public void initializeItems() {
        main.addItem(createGuiItem(Material.OAK_SAPLING, "Map Selection", "§aVote on which map you'd like to play"));
        main.addItem(createGuiItem(Material.GLASS_PANE, "Map Size", "§aVote on how tightly packed you'd like the map to be"));
    }

    protected ItemStack createGuiItem(final Material material, final String name, final String... lore) {
        final ItemStack item = new ItemStack(material, 1);
        final ItemMeta meta = item.getItemMeta();

        meta.setDisplayName(name);
        meta.setLore(Arrays.asList(lore));
        item.setItemMeta(meta);
        return item;
    }

    public void openInventory(final HumanEntity ent) {
        ent.openInventory(main);
    }

    @EventHandler
    public void onInventoryClick(final InventoryClickEvent e) {
        if (e.getInventory() != main) return;
        e.setCancelled(true);
        final ItemStack clickedItem = e.getCurrentItem();

        if (clickedItem == null || clickedItem.getType() == Material.AIR) return;
        final Player p = (Player) e.getWhoClicked();

        p.sendMessage("You clicked at slot " + e.getRawSlot());
    }

    @EventHandler
    public void onInventoryClick(final InventoryDragEvent e) {
        if (e.getInventory() == main) {
            e.setCancelled(true);
        }
    }

}

If someone could point to what I'm doing wrong, I'd appreciate it. The guide might just be outdated and I'm too new to this to know the current standards.

 

@abstractionAlpha

launchGUI gui = new launchGUI();

Create this in a global variable in your main class, andv dun register twice the same class.

then you can do on your command : player.openInventory(gui.main)

And remove the keyword final in the listener method