Using ASM

Hi, I need to replace the contents of the method public void updateWeatherBody() in World, without editing the base class. From what I've read, it seems like I need to use ASM to do this at runtime. Can anyone help?

I don't know how to help you, but it seems you have the same sort of question I do(http://www.minecraftforge.net/forum/index.php/topic,3465.0.html). If you figure it out, there'd be cookies in it for you ;p

I don't know if his mod setup is still up-to-date on how to do things, but this might get you started:

https://github.com/dries007/SimpleCore2/tree/master/src/common/dries007/SimpleCore/asm

Edit: I'm however not sure how to deal with legal issues if I want to replace a base-class and upload it to github... anybody knows how to do that properly?

You might want to look at how NEI does it, or look at LuaForge

The only way I've seen it done is to modify the class and package it with your coremod. Override the class with a Transformer like how NEI does.

Here is an example of a class overrider in the same vein as NEI. Link. Here is it being used in a Transformer. Link.

You set the location in your FMLLoadingPlugin in injectData with a line like:

location = (File) data.get("coremodLocation");