Async

Evidence

Ran on Kiln's test stand (2026-11-04): AsyncFabric did not start: java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager.

What it needs from Kiln

• an access widener
• Mixin
• 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.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.commands.arguments.IdentifierArgument
• net.minecraft.network.chat.Style
• net.minecraft.server.MinecraftServer
• net.minecraft.server.level.ServerChunkCache
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.boss.enderdragon.EnderDragon
• net.minecraft.world.entity.item.FallingBlockEntity
• net.minecraft.world.entity.monster.Shulker
• net.minecraft.world.entity.projectile.Projectile
• net.minecraft.world.entity.vehicle.boat.AbstractBoat
• net.minecraft.world.entity.vehicle.minecart.AbstractMinecart
• net.minecraft.world.level.ChunkPos
• org.apache.logging.log4j.LogManager
• org.apache.logging.log4j.Logger
• Holder.getRegisteredName()
• BuiltInRegistries.ENTITY_TYPE
• Component.copy()
• MutableComponent.withStyle()
• ServerLevel.dimensionTypeRegistration()
• ServerLevel.getAllEntities()
• ServerLevel.getChunkSource()
• ServerLevel.tickNonPassenger()
• Entity.checkDespawn()
• Entity.chunkPosition()
• Entity.getType()
• Entity.isAlive()
• Entity.isRemoved()
• Entity.portalProcess

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

Async improves entity performance by processing entities in parallel across multiple CPU cores and threads.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file async-fabric-0.2.5+alpha-26.3.jar. The scan reads the mod's classes; it does not run them.