Answers for "how to create a repeating task in spigot"

spigot repeating task

Bukkit.getScheduler().scheduleSyncRepeatingTask(plugin, new Runnable() {
    @Override
    public void run() {
        Bukkit.broadcastMessage("This message is shown immediately and then repeated every second");
    }
}, 0L, 20L); //0 Tick initial delay, 20 Tick (1 Second) between repeats