Multiplayer Spawners

Evidence

Ran on Kiln's test stand (2026-11-04): MultiplayerSpawnersFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/world/item/StandingAndWallBlockItem; MultiplayerSpawnersFabricClient did not start: java.lang.NoClassDefFoundError: net/minecraft/network/protocol/common/custom/CustomPacketPayload.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientChunkEvents
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientChunkEvents.Load
• net.fabricmc.fabric.api.client.event.lifecycle.v1.ClientChunkEvents.Unload
• 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.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarting
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopping
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndTick
• 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.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.core.particles.DustParticleOptions
• net.minecraft.core.particles.ParticleTypes
• net.minecraft.nbt.CompoundTag
• net.minecraft.network.FriendlyByteBuf
• 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.permissions.PermissionSet
• net.minecraft.server.permissions.Permissions
• net.minecraft.server.players.PlayerList
• net.minecraft.tags.TagKey
• net.minecraft.util.ProblemReporter
• net.minecraft.world.item.StandingAndWallBlockItem
• net.minecraft.world.level.ChunkPos
• and 39 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

Never miss out on dungeon experience again! Each player gets their own spawner experience - disable spawners for yourself while keeping them active for friends who haven't explored yet

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file Multiplayer Spawners - Fabric - 26.3 - 2.0.2.jar. The scan reads the mod's classes; it does not run them.