[1.11.2] Quick Question About Accessing Private Fields With Java Reflection

[Paladin]

Hello, I'm creating a mod in which I'd like to adjust a value of one private variables in the Minecraft's original MapGenVillage.class. 

 

The variables I'm trying to change:

 

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private int distance;

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I made an attempts using the Reflection Helper to access and modify these values but:

 

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ReflectionHelper.setPrivateValue(MapGenVillage.class, null, 8, 2);

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Doesn't solve the problem at all (I think it throws a NullPointerException).

 

Is there a way I can change the value without an instance of the class?

[Choonster]

No, it's an instance field so you need to specify which instance to change the field's value for.

 

If you get/set the value of a field or call a method with reflection more than once, you should use ReflectionHelper.findField/findMethod to look up the Field/Method object, store it in a private static field and then use it whenever you need to interact with the field/method. Looking up the Field/Method object is relatively slow, so you should only do it once.

[Paladin]

Thanks for the response, but the problem is that I want to edit that private value so that it allows villages to spawn closer together when vanilla minecraft generates them... I don't need to reference the value in my own mod's code. But if I need an instance, I might as well create my own custom MapGenVillage.class. I wasn't planning on doing this simply because I thought that'll be a lot of effort when I could just to change one private variable in vanilla minecraft's code to solve my problem

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[Choonster]

InitMapGen is fired when ChunkProviderOverworld/ChunkProviderHell initialise their MapGenBase instances, you can use this to replace or modify them.

 

InitMapGenEvent#getType will return InitMapGenEvent.EventType.VILLAGE when the MapGenBase being initialised (InitMapGenEvent#getOriginalGen) is a MapGenVillage.

[Paladin]

Thanks, I've fixed my problem now.