filament

Evidence

Ran on Kiln's test stand (2026-11-04): Filament did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/resource/SimpleSynchronousResourceReloadListener; FilamentClient did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/networking/v1/ServerPlayConnectionEvents.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.authlib.GameProfile
• com.mojang.math.Axis
• net.fabricmc.fabric.api.biome.v1.BiomeModifications
• net.fabricmc.fabric.api.biome.v1.BiomeSelectionContext
• net.fabricmc.fabric.api.biome.v1.BiomeSelectors
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.EventFactory
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents.Unload
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
• 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.event.player.PlayerBlockBreakEvents
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents.After
• net.fabricmc.fabric.api.event.player.UseBlockCallback
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Init
• net.fabricmc.fabric.api.networking.v1.context.PacketContext
• net.fabricmc.fabric.api.networking.v1.context.PacketContext.Key
• net.fabricmc.fabric.api.networking.v1.context.PacketContext.ReadKey
• net.fabricmc.fabric.api.networking.v1.context.PacketContextProvider
• net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder
• net.fabricmc.fabric.api.object.builder.v1.block.entity.FabricBlockEntityTypeBuilder.Factory
• net.fabricmc.fabric.api.object.builder.v1.entity.FabricDefaultAttributeRegistry
• net.fabricmc.fabric.api.registry.FlammableBlockRegistry
• net.fabricmc.fabric.api.registry.FlammableBlockRegistry.Entry
• net.fabricmc.fabric.api.registry.VillagerInteractionRegistries
• net.fabricmc.fabric.api.resource.SimpleSynchronousResourceReloadListener
• net.fabricmc.fabric.impl.content.registry.FireBlockHooks
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.fabricmc.loader.api.metadata.Person
• net.minecraft.advancements.triggers.CriteriaTriggers
• net.minecraft.advancements.triggers.ItemUsedOnLocationTrigger
• net.minecraft.advancements.triggers.PlayerTrigger
• net.minecraft.advancements.triggers.ShotCrossbowTrigger
• and 80 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

Data driven Items, Blocks, Decorations and Mobs for Fabric based servers. No client mods required!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file filament-1.8.5-hotfix.1+26.3.jar. The scan reads the mod's classes; it does not run them.