Limit Zombie pathfinding range OR check whether target is reachable?

Well, the title pretty much says it all.

What I'm looking for is a method to either find out whether a target (entity/location) of a zombie is reachable (like if the zombie can actually reach that location) or limit the zombie pathfinding range as such.

The reason why I need to know that is explained here:

I am trying to create a server with lots of zombies and this bug isn't really helping me with that.

Thank you!

 

as far I know, the following class is used by a zombie to do the path finding:
https://github.com/Bukkit/CraftBukk...necraft/server/PathfinderGoalMeleeAttack.java
Because most of the variables and fields are obfused, it is hard to saw what is the distance and the other factors. if you play a little with it, I hope you find it how to limit the zombies

 

The question is: Where exactly "is" that class? I can not find a suitable get-method inside the zombie class.

 

It's NMS code; things you are told to never touch unless you want to go above and beyond Bukkit.
You'll have to use Reflection to get a foothold onto this, and then even more reflection to set these fields. Worst comes to worse, you might have to create your own PathfinderGoal and add that in manually.

 

I see... Thank you for telling me that, I'll try to get my hands dirty now