public class Main extends JavaPlugin {

    public void onEnable() {
        CommandHandler cH = new CommandHandler();
        getCommand("Smelt").setExecutor(cH);
        getCommand("smelt").setExecutor(cH);

        getServer().getScheduler().scheduleSyncRepeatingTask(this, new Runnable() {

            public void run() {
                getServer().broadcastMessage(ChatColor.AQUA + "Remember: Use the command /smelt to smelt your ores!");
            }

        }, 0L, 2 * 60 * 20L);
    }

}