[1.17.1] Overriding Vanilla method

[KopoL]

Forge 1.17.1
Hello. I want to do something like scare mobs potion effect. It basically would make mobs ignore the player, just like on gamemode creative. I discovered that when I give player disableDamage ability (player.abilities.disableDamage), mobs start to ignore the player. But I don't want to make player invulnerable (I'll use tags).
Then I found this method in MobEntity class:

public boolean canAttack(LivingEntity target) {
      return target.getType() == EntityType.PLAYER && ((PlayerEntity)target).abilities.disableDamage ? false : super.canAttack(target);
   }

I just need to somehow override/change/...? it to something like

return target.getType() == EntityType.PLAYER && ((PlayerEntity)target).getTags().contains("scare_mobs") ? false && ((PlayerEntity)target).abilities.disableDamage ? false : super.canAttack(target);)

but I don't really know how. What is the best way to do this, without breaking the game?

Edited August 26, 2021 by KopoL

[Luis_ST]

1.15 is no longer supported on this forum.
Please update to a modern version of Minecraft to receive support.

[KopoL]

I am using 1.17.1 now.

[Luis_ST]

are you sure you updated to 1.17?
post updated code

[KopoL]

Everything is still the same, only mappings changed.

[Luis_ST]

only possible via coremodding
ask on the forge discord server in the non-api-modding chanel
there are the experts about coremodding

[KopoL]

Okay, thank you. But do you think of any other way to prevent them from attacking the player without making him invulnerable - without using abilities? Because using core modding is my final solution, If I had any other option I'd prefer to use it.

[Luis_ST]

  On 8/26/2021 at 7:51 PM, Luis_ST said:

only possible via coremodding

Expand  

there is no Hook or Event where you can use

[KopoL]

Ok, thank you anyway. I'll try with coremodding.

[poopoodice]

You can possibly replace their target goals.