For my Resource Dumper mod I'm working on, I loop through the Item Registry then loop through each sub-type given by the getSubItems method and save each ItemStack in an ArrayList assigning it a random UUID. Then as I go through each recipe I look for the ingredient and the aforementioned arraylist to get the UUID. All of this info is stored in JSON files, the items (dubbed resources) in its own file and the recipes in its own file with the ingredients referencing items in the resources file. Now for the most part this system works perfectly.

 

However my mod is not able to find information about certain blocks like slime blocks, hay bales, blocks of coal; redstone; lapis; emerald, etc. I suspected this to be because when a Block is given to an ItemStack, the block is wrapped in an ItemBlock instance and this would cause ItemStack.isItemEqual to give a false negative. I ruled this out because my resource dumper is able to equate Quartz Slabs and Chiseled Quartz Slabs when using the former to make the later in a recipe.

 

This leads me to believe the cause is a metadata/nbt quirk which leads me to my question: Where does Minecraft (and Forge I suppose) create the recipes for all its blocks and items so that I could rule that out as a possibility?

Minecraft creates its recipes in the

CraftingManager

constructor, Forge replaces some of these with ore recipes in

OreDictionary.initVanillaEntries

.