CombinedWorld

Evidence

Ran on Kiln's test stand (2026-11-04): ItemStorage did not start: java.lang.NoClassDefFoundError: net/minecraft/util/ProblemReporter.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.authlib.GameProfile
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.arguments.DimensionArgument
• net.minecraft.commands.arguments.EntityArgument
• net.minecraft.commands.arguments.GameProfileArgument
• net.minecraft.commands.arguments.HexColorArgument
• net.minecraft.commands.arguments.IdentifierArgument
• net.minecraft.commands.arguments.coordinates.Vec3Argument
• net.minecraft.core.UUIDUtil
• net.minecraft.core.component.DataComponentPatch
• net.minecraft.core.component.DataComponentPatch.Builder
• net.minecraft.core.component.DataComponents
• net.minecraft.core.component.TypedDataComponent
• net.minecraft.nbt.CompoundTag
• net.minecraft.nbt.NbtAccounter
• net.minecraft.nbt.NbtIo
• net.minecraft.nbt.NbtOps
• net.minecraft.nbt.NbtUtils
• net.minecraft.network.protocol.game.ClientboundAddEntityPacket
• net.minecraft.network.protocol.game.ClientboundGameEventPacket
• net.minecraft.network.protocol.game.ClientboundGameEventPacket.Type
• net.minecraft.resources.RegistryOps
• net.minecraft.server.MinecraftServer
• net.minecraft.server.level.ServerPlayer.RespawnConfig
• net.minecraft.server.level.ServerPlayerGameMode
• net.minecraft.server.network.CommonListenerCookie
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.server.permissions.Permission
• net.minecraft.server.permissions.Permission.HasCommandLevel
• net.minecraft.server.permissions.PermissionLevel
• net.minecraft.server.permissions.PermissionSet
• net.minecraft.server.players.NameAndId
• net.minecraft.server.players.PlayerList
• net.minecraft.util.ProblemReporter
• net.minecraft.util.ProblemReporter.PathElement
• net.minecraft.util.ProblemReporter.ScopedCollector
• net.minecraft.util.datafix.DataFixers
• and 61 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

Switch between dimensions as if they are different servers.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file combinedworld-1.38.jar. The scan reads the mod's classes; it does not run them.