Ultimate Key Lock

Evidence

Ran on Kiln's test stand (2026-11-04): UltimateKeyLock did not start: java.lang.NoClassDefFoundError: net/minecraft/core/dispenser/DispenseItemBehavior; UltimateKeyLockClient did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayConnectionEvents.Disconnect
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
• net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
• net.fabricmc.fabric.api.event.player.AttackBlockCallback
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents.Before
• net.fabricmc.fabric.api.event.player.UseBlockCallback
• net.fabricmc.fabric.api.event.player.UseEntityCallback
• net.fabricmc.fabric.api.networking.v1.PayloadTypeRegistry
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
• net.fabricmc.fabric.api.networking.v1.ServerPlayNetworking
• net.minecraft.core.UUIDUtil
• net.minecraft.core.component.DataComponentType
• net.minecraft.core.component.DataComponents
• net.minecraft.core.dispenser.BlockSource
• net.minecraft.core.dispenser.DefaultDispenseItemBehavior
• net.minecraft.core.particles.ParticleTypes
• net.minecraft.nbt.CompoundTag
• net.minecraft.network.FriendlyByteBuf
• net.minecraft.network.chat.Style
• net.minecraft.network.chat.contents.TranslatableContents
• 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.server.MinecraftServer
• net.minecraft.server.level.ChunkMap
• net.minecraft.server.level.ServerChunkCache
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.server.players.PlayerList
• net.minecraft.tags.ItemTags
• net.minecraft.tags.TagKey
• net.minecraft.util.Prediction
• net.minecraft.world.Container
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.item.ItemEntity
• net.minecraft.world.entity.player.Inventory
• and 65 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

Allows to lock Doors and Containers with Trial Keys!

Scan

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