LoTAS-Light

Evidence

Ran on Kiln's test stand (2026-11-04): LoTASLight did not start: java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager; LoTASLightClient did not start: java.lang.NoClassDefFoundError: net/minecraft/server/MinecraftServer.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.platform.InputConstants.Key
• com.mojang.blaze3d.platform.Window
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.EventFactory
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
• net.minecraft.client.gui.Hud
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.components.ChatComponent
• net.minecraft.client.gui.components.EditBox
• net.minecraft.client.gui.screens.ChatScreen
• net.minecraft.client.gui.screens.TitleScreen
• net.minecraft.client.gui.screens.inventory.SignEditScreen
• net.minecraft.client.gui.screens.worldselection.WorldOpenFlows
• net.minecraft.client.input.KeyEvent
• net.minecraft.client.input.MouseButtonEvent
• net.minecraft.client.renderer.RenderPipelines
• net.minecraft.client.resources.language.I18n
• net.minecraft.client.server.IntegratedServer
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.commands.Commands.CommandSelection
• net.minecraft.network.chat.ClickEvent
• net.minecraft.network.chat.ClickEvent.Action
• net.minecraft.network.chat.ClickEvent.CopyToClipboard
• net.minecraft.network.chat.ClickEvent.RunCommand
• net.minecraft.network.chat.ClickEvent.SuggestCommand
• net.minecraft.network.chat.ComponentUtils
• net.minecraft.network.chat.HoverEvent
• net.minecraft.network.chat.HoverEvent.Action
• net.minecraft.network.chat.HoverEvent.ShowText
• net.minecraft.network.chat.Style
• net.minecraft.server.MinecraftServer
• net.minecraft.server.ServerTickRateManager
• net.minecraft.util.ARGB
• net.minecraft.util.Util
• net.minecraft.world.TickRateManager
• net.minecraft.world.level.storage.LevelStorageSource
• and 24 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

Tools for creating Tool-Assisted Speedruns in MC 1.21+

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file LoTAS-Light-26.3-1.3.7.jar. The scan reads the mod's classes; it does not run them.