Server Backpacks!

Evidence

Ran on Kiln's test stand (2026-11-04): ServerBackpacks did not start: java.lang.NoSuchFieldError: Class net.minecraft.core.registries.Registries does not have member field 'net.minecraft.resources.ResourceKey ENCHANTMENT'.

What it needs from Kiln

• Mixin
• com.mojang.authlib.GameProfile
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.datagen.v1.provider.FabricTagsProvider
• net.fabricmc.fabric.api.datagen.v1.provider.FabricTagsProvider.ItemTagsProvider
• net.fabricmc.fabric.api.entity.event.v1.ServerPlayerEvents.Leave
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.BeforeSave
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarting
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopped
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopping
• net.fabricmc.fabric.api.event.player.UseBlockCallback
• net.fabricmc.fabric.api.event.registry.FabricRegistryBuilder
• net.fabricmc.fabric.api.lookup.v1.block.BlockApiLookup
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
• net.fabricmc.fabric.api.networking.v1.context.PacketContext
• net.fabricmc.fabric.api.networking.v1.context.PacketContext.ReadKey
• net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder
• net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder.Factory
• net.fabricmc.fabric.api.transfer.v1.item.ContainerStorage
• net.fabricmc.fabric.api.transfer.v1.item.ItemStorage
• net.fabricmc.loader.api.ModContainer
• net.minecraft.SharedConstants
• net.minecraft.WorldVersion
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.core.HolderSet
• net.minecraft.core.HolderSet.Named
• net.minecraft.core.NonNullList
• net.minecraft.core.RegistryAccess
• net.minecraft.core.RegistryAccess.Frozen
• net.minecraft.core.UUIDUtil
• net.minecraft.core.component.DataComponentGetter
• net.minecraft.core.component.DataComponentMap
• net.minecraft.core.component.DataComponentType
• net.minecraft.core.component.DataComponentType.Builder
• net.minecraft.core.component.DataComponents
• and 80 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3), Machines (0.4), Mixin (0.5)

In the author's words

A server-side backpacks mod that uses Polymer, with added GeyserMC support.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file serverbackpacks-1.6+26.3.jar. The scan reads the mod's classes; it does not run them.