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public class Main extends JavaPlugin implements Listener {
	@Override
	public void onEnable() {
		Bukkit.getPluginManager().registerEvents(this, this);
	}
	
	@EventHandler
	private void onPlayerJoin(PlayerJoinEvent event) {
		//Hide all players from each other
		for(Player player : Bukkit.getOnlinePlayers()) {
			for(Player otherPlayer : Bukkit.getOnlinePlayers()) {
				player.hidePlayer(this, otherPlayer);
			}
		}
	}
	
	@EventHandler
	private void onPlayerInteract(PlayerInteractEvent event) {
		//Send a message when a player left-clicks the air
		if(event.getAction() == Action.LEFT_CLICK_AIR) {
			Bukkit.broadcastMessage(event.getPlayer().getName() + " left-clicked the air!");
		}
	}
}

+        org.bukkit.util.RayTraceResult result = this.player.level.getWorld().rayTrace(origin, origin.getDirection(), d3, org.bukkit.FluidCollisionMode.NEVER, false, 0.1, entity -> entity != this.player.getBukkitEntity() && (!(entity instanceof Player entityPlayer) || this.player.getBukkitEntity().canSee(entityPlayer)));