Unloaded Activity

Evidence

Ran on Kiln's test stand (2026-11-04): UnloadedActivityFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/server/packs/resources/PreparableReloadListener.

What it needs from Kiln

• an access widener
• Mixin
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents.Load
• 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.ServerStarted
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopping
• net.fabricmc.fabric.api.resource.v1.ResourceLoader
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.metadata.CustomValue
• net.fabricmc.loader.api.metadata.CustomValue.CvArray
• net.fabricmc.loader.api.metadata.CustomValue.CvObject
• net.fabricmc.loader.api.metadata.CustomValue.CvType
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.arguments.ResourceOrTagKeyArgument
• net.minecraft.commands.arguments.ResourceOrTagKeyArgument.Result
• net.minecraft.core.HolderSet
• net.minecraft.core.HolderSet.Named
• net.minecraft.resources.FileToIdConverter
• net.minecraft.server.MinecraftServer
• net.minecraft.server.packs.PackType
• net.minecraft.server.packs.resources.Resource
• net.minecraft.server.packs.resources.ResourceManager
• net.minecraft.server.packs.resources.SimplePreparableReloadListener
• net.minecraft.server.permissions.Permission
• net.minecraft.server.permissions.Permission.HasCommandLevel
• net.minecraft.server.permissions.PermissionLevel
• net.minecraft.server.permissions.PermissionSet
• net.minecraft.tags.TagKey
• net.minecraft.util.Mth
• net.minecraft.util.profiling.ProfilerFiller
• net.minecraft.world.entity.EntityType
• net.minecraft.world.level.BlockGetter
• net.minecraft.world.level.ChunkPos
• net.minecraft.world.level.LevelReader
• net.minecraft.world.level.block.CropBlock
• net.minecraft.world.level.block.StemBlock
• and 39 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

Simulates blocks and entities to catch up after being unloaded for a period of time.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file unloadedactivity-0.7.3+mc26.3.jar. The scan reads the mod's classes; it does not run them.