Player hasLineOfSight() - always true

I tested hasLineOfSight() method with some entities and found that method always return true for Player and Spider. But with Villager (and some other entities) was sufficiently accurate with returning true/false. Is there any way how can I use this method with Villager-like "line of sight" but for Player? Best solution I found is:

1) spawn temporary entity with "right line of sight" (e.g Bat because it's small) on player's location​

2) check its line of sight​

3) de-spawn temp entity​

But this solution have one small problem. Temporary entity appear for a small amount of time.​

Know anybody how solve this better?​

I'm still quite beginner in Java/Bukkit.​

 

what are you trying to do?

 

Check if player can see other player

 

I am interested with that problem too. Anyone can help?

#Edit
I found trick. Spawning entity (eg. bat) when spawning mobs is disabled it works fine

 

if(player.canSee(otherplayer))?

 

That works with invisibility and such, not with actual line of sight.

 

I programming special gametype and I don't need hostile mobs. So I can spawn Sliverfish and it never appear. But it isn't solution for everyone. I think somebody familiar with net.minecraft.server and maybe packets can do this.

EDIT: Just realized I can cancel CreatureSpawnEvent with specific EntityType. And... IT WORKS! But I must say goodbye to one EntityType.