"Freeze" a mob

Hey there. I am making a plugin where I am using a villager. I need the villager to be still. I have got the code the set his speed really slow:

Code:

villager.addPotionEffect(new PotionEffect(PotionEffectType.SLOW, 1000000000, 255, false, false));

but when I get in-game and try to use my other command to delete him, it does not work. My command requires the villager in the same spot as the player, but when ever I walk up to the villager he starts being pushed by me. I am looking for something like:

Code:

villager.setMoveable(false);

but I understand that it can be a little complicated. Any suggestions?

Thank you for your time!

 

@mttprvst13 It requires NMS to spawn unmovable entities.

 

NMS, use it to set AI to 1.

Disabling AI disables it from moving to i believe, dont quote me incase im wrong lol.