Event handlers and threads/runnables?

So I have the following code:

Code:

   
public void messagePlayerAfterDelay(Player player) {
        try {
            Thread.sleep(3000); //Sleep for 3 seconds
            player.sendMessage("You got damaged 3 seconds ago"); //Message player after 3 seconds
        } catch(InterruptedException ex) {
            Thread.currentThread().interrupt();
        }
    }
   
    @EventHandler
    public void playerHitPlayerEvent(EntityDamageByEntityEvent e) {
        Entity damaged = e.getEntity();
        if(damaged instanceof Player) {
            Player player = (Player) damaged;
            player.sendMessage("You just got damaged! ");
            messagePlayerAfterDelay(player);
        }
    }

Basically, in the code above, I want the player to be messaged 3 seconds after they take damage. The problem is, that when calling

Code:

messagePlayerAfterDelay(player)

, which has a 3 second delay, it causes a 3 second delay between when the player takes damage and when they take knockback (which occurs after the event handler is finished). For example, with that code, if a player were to get hit by another player, then they would stand still for 3 seconds and then take the damage from the hit as well as the knockback after 3 seconds has passed.

I need the function messagePlayerAfterDelay to be ran without waiting for it to finish. I believe i need to use runnables / threads for this, but I was confused on how to do that because an event handler is involved. Basically, I want the player to be knocked back and take damage like normal, and then 3 seconds later get messaged.

 

@nonperson32835 Bukkit rule 7: NEVER SLEEP THE THREAD! This will freeze the whole server as you are sleeping the main thread.

Look into Bukkit schedulers, there is a nice wiki tutorial

 

@nonperson32835 @bwfcwalshy
Link to wiki about schedulers.