Block Variant Swapper

Evidence

Ran on Kiln's test stand (2026-11-04): BlockVariantSwapper did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/resource/IdentifiableResourceReloadListener; BlockVariantSwapperClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/resource/IdentifiableResourceReloadListener.

What it needs from Kiln

• Mixin
• com.mojang.blaze3d.platform.InputConstants.Key
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.EndDataPackReload
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarting
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.Context
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.resource.ResourceManagerHelper
• net.fabricmc.fabric.api.resource.SimpleSynchronousResourceReloadListener
• net.minecraft.core.HolderSet
• net.minecraft.network.codec.ByteBufCodecs
• net.minecraft.network.codec.StreamCodec
• net.minecraft.network.protocol.common.custom.CustomPacketPayload
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.Type
• net.minecraft.network.protocol.common.custom.CustomPacketPayload.TypeAndCodec
• net.minecraft.network.protocol.game.ClientboundSetPlayerInventoryPacket
• net.minecraft.server.MinecraftServer
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.server.packs.PackType
• net.minecraft.world.entity.player.Inventory
• net.minecraft.world.item.ItemStackTemplate
• net.minecraft.world.item.crafting.Ingredient
• net.minecraft.world.item.crafting.Recipe
• net.minecraft.world.item.crafting.RecipeHolder
• net.minecraft.world.item.crafting.RecipeManager
• net.minecraft.world.item.crafting.ShapedRecipe
• net.minecraft.world.item.crafting.ShapedRecipePattern
• net.minecraft.world.item.crafting.ShapelessRecipe
• net.minecraft.world.item.crafting.SingleItemRecipe
• net.minecraft.world.item.crafting.display.RecipeDisplay
• net.minecraft.world.item.crafting.display.SlotDisplay
• net.minecraft.world.item.crafting.display.SlotDisplay.ItemSlotDisplay
• net.minecraft.world.item.crafting.display.SlotDisplay.ItemStackSlotDisplay
• net.minecraft.world.level.storage.WorldData
• net.fabricmc.fabric.api.resource.IdentifiableResourceReloadListener
• InputConstants.getKey()
• Identifier.tryParse()
• ServerPlayer.connection
• ServerPlayer.getInventory()
• and 1 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

A lightweight mod that lets you swap a held block between its variants - planks to stairs, slabs, fences, doors, etc. - on the fly, without opening a crafting table or stonecutter.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file blockvariantswapper-fabric-26.3-1.0.2.jar. The scan reads the mod's classes; it does not run them.