I'm trying to register spawn eggs for some vanilla mobs that don't currently have them (specifically EnderDragons, IronGolems, WitherBosses and Snowmen).

 

I tried to re-register them with EntityRegistry#registerGlobalEntityID but I get an error saying that it was already registered. Plus, doing that seems like a bad idea to begin with.

 

Do I have to create a new item type for spawning them? Or can I just add standard eggs for them another way?

Sorr Iy only have the FML 1.8 environment on my pc so this *may* be different- but check the internal class EntityEggInfo.class in the EntityList.class. There's an addMapping() method that adds the entity egg to the list of possibilities with the egg color and such

Thanks RANKSHANK that's what I had tried before, but you gave me another idea when you said that. You can't register something twice, but I went to look at the code where the entity gets registered. [embed=425,349]EntityRegistry.registerGlobalEntityID(Class <? extends Entity > entityClass, String entityName, int id, int backgroundEggColour, int foregroundEggColour)[/embed] actually calls [embed=425,349]EntityList.addMapping(Class p_75614_0_, String p_75614_1_, int p_75614_2_, int p_75614_3_, int p_75614_4_)[/embed]. That appends a value to a static ArrayList within [embed=425,349]EntityList[/embed] called [embed=425,349]entityEggs[/embed]. So, to add a new egg manually for an entity that already exists, I figured out you can do this:

 

[embed=425,349]net.minecraft.entity.EntityList.entityEggs.put(Integer.valueOf(63), new EntityList.EntityEggInfo(63, 1, 0));[/embed]

 

I'll leave this thread open for a bit in case someone else has a better way or a question. Thanks for the reply!

Although this works fine when running from eclipse, I get NoSuchField exceptions when trying to access the same ArrayList after exporting the mod. Does anyone know why this could be?