So I'm designing a mod for Forge 10.13.3.1403 that adds in some of the 1.8 blocks and items, because my server has to run on 1.7.10 but we want some of the new stuff.

 

I've been trying to get my mod's blocks to register as the vanilla blocks, so that they will automatically replace on a world generated in 1.8. I have that successfully working via GameRegistry.addSubstitutionAlias(), but I'm running in to a lot of other problems using that command.

 

For some reason addSubstitutionAlias() registers the block twice on the creative tab. Once in the correct, Vanilla location, and once at the end of the tab.

 

I could deal with that first issue, but the bigger issue is that when substituting blocks with metadata in you can't set recipes using that meta data. If I create the recipe using new ItemStack(ModBlocks.stone, 1, 1), ItemStack.getItem() returns null. If I use new ItemStack(Blocks.stone, 1, 1), it doesn't draw the sprite correctly on the crafting bench and crashes when I craft the item.

 

So does anyone know of a good way to replace vanilla items? Or maybe fix the way I'm using addSubstitutionAlias()? I tried registering the block with the minecraft modID, but those functions are all deprecated.

 

Here's the code I'm registering my block with:

 

//Spawn in new stones
try {
        stone = new ModStone();
GameRegistry.addSubstitutionAlias("minecraft:stone", GameRegistry.Type.BLOCK, stone);
GameRegistry.addSubstitutionAlias("minecraft:stone", GameRegistry.Type.ITEM, new ItemBlockStone(stone));
} catch (ExistingSubstitutionException e) {
 // TODO Auto-generated catch block
e.printStackTrace();
}

I've not ever seen someone with code that works for

addSubstitutionAlias

, so I don't know how it's supposed to work or be used (etc. etc.) and only seen non-working code, one way or another.

 

So that said, my first question is:

What happens if you only call

addSubstitutionAlias

once, either for the Type.Block or Type.Item? (rather than calling both)

 

Second question:

Does your

ModStone

call

setCreativeTab

?  What happens if you comment that out?

 

I imagine that something breaks, but that'd be my first experiment: figure out which line(s) are adding the extra addition to the creative menus, why, and what breaks as a result.

Yeah in my research it seems a bit sketchy.

 

If I just call for one, it breaks and throws an error when you try to load the world saying the Mod ID list has been corrupted.

 

My ModStone does call SetCreativeTab, if I comment that out it doesn't show up at all in creative.

 

I've iterated through the actual Item.itemRegistry, and my stone is actually appearing twice on the list, at the beginning and the end.

May have to live with it, then.

The duplicates I can live with, but the recipes being broken makes it pretty hard.

but the recipes being broken makes it pretty hard.

 

That would be a problem.

Yeah, it throws a null reference exception when creating an itemstack of the modded item.

 

If I create the recipe using new ItemStack(ModBlocks.stone, 1, 1), ItemStack.getItem() returns null. If I use new ItemStack(Blocks.stone, 1, 1), it doesn't draw the sprite correctly on the crafting bench and crashes when I craft the item.

FYI, ganymedes01 already has a mod that does this, Et Futurum.