JEI / REI / EMI WorldGen

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): JEIWorldGenModFabric did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/networking/v1/ServerLoginNetworking$LoginQueryResponseHandler; JEIWorldGenModFabricClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/client/networking/v1/ClientLoginNetworking$LoginQueryRequestHandler.

What it needs from Kiln

Mixin
io.netty.buffer.Unpooled
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientEntityEvents
net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientEntityEvents.Load
net.fabricmc.fabric.api.client.networking.v1.ClientLoginNetworking
net.fabricmc.fabric.api.client.networking.v1.ClientLoginNetworking.LoginQueryRequestHandler
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLevelEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLevelEvents.Load
net.fabricmc.fabric.api.networking.v1.FriendlyByteBufs
net.fabricmc.fabric.api.networking.v1.LoginPacketSender
net.fabricmc.fabric.api.networking.v1.ServerLoginConnectionEvents
net.fabricmc.fabric.api.networking.v1.ServerLoginConnectionEvents.QueryStart
net.fabricmc.fabric.api.networking.v1.ServerLoginNetworking
net.fabricmc.fabric.api.networking.v1.ServerLoginNetworking.LoginQueryResponseHandler
net.fabricmc.fabric.api.networking.v1.ServerLoginNetworking.LoginSynchronizer
net.minecraft.advancements.predicates.DataComponentMatchers
net.minecraft.advancements.predicates.EnchantmentPredicate
net.minecraft.advancements.predicates.ItemPredicate
net.minecraft.core.HolderSet
net.minecraft.core.RegistryAccess
net.minecraft.core.component.predicates.DataComponentPredicate
net.minecraft.core.component.predicates.DataComponentPredicate.Type
net.minecraft.core.component.predicates.DataComponentPredicates
net.minecraft.core.component.predicates.EnchantmentsPredicate
net.minecraft.network.FriendlyByteBuf
net.minecraft.server.MinecraftServer
net.minecraft.server.ReloadableServerRegistries
net.minecraft.server.ReloadableServerRegistries.Holder
net.minecraft.util.valueproviders.IntProvider
net.minecraft.world.item.ItemStackTemplate
net.minecraft.world.item.enchantment.Enchantments
net.minecraft.world.level.biome.Biome
net.minecraft.world.level.biome.BiomeGenerationSettings
net.minecraft.world.level.levelgen.GenerationStep
net.minecraft.world.level.levelgen.GenerationStep.Decoration
net.minecraft.world.level.levelgen.feature.AbstractOreFeature
net.minecraft.world.level.levelgen.feature.BlockReplacement
net.minecraft.world.level.levelgen.feature.Feature
net.minecraft.world.level.levelgen.feature.ScatteredOreFeature
net.minecraft.world.level.levelgen.heightproviders.BiasedToBottomHeight
net.minecraft.world.level.levelgen.heightproviders.ConstantHeight
and 27 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Mixin (0.5)

In the author's words

JEI/REI/EMI Addon for World Gen Information with universal compatibility for all mods ores by utilizing biome generation data

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file jeiworldgen-fabric-26.3-1.4.6.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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