@Override
    protected void registerCommands() {
        PluginCommand<?> command = (PluginCommand<?>) this.bootstrap.getServer().getPluginCommand("luckperms");
        this.commandManager = new NukkitCommandExecutor(this, command);
        this.commandManager.register();
    }
LuckPerms implementation for the Nukkit API.
nukkit/src/main/java/me/lucko/luckperms/nukkit/LPNukkitPlugin.java