ModernFix-mVUS

Evidence

Ran on Kiln's test stand (2026-11-04): ModernFixFabric did not start: java.lang.NoClassDefFoundError: org/apache/logging/log4j/LogManager; ModernFixClientFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/util/MemoryReserve.

What it needs from Kiln

• an access widener
• Mixin
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents
• net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.AfterInit
• net.fabricmc.fabric.impl.datagen.FabricDataGenHelper
• net.minecraft.CrashReport
• net.minecraft.DefaultUncaughtExceptionHandlerWithName
• net.minecraft.ReportType
• net.minecraft.ReportedException
• net.minecraft.SharedConstants
• net.minecraft.TracingExecutor
• net.minecraft.WorldVersion
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.screens.TitleScreen
• net.minecraft.commands.CommandSourceStack
• net.minecraft.commands.Commands
• net.minecraft.server.Bootstrap
• net.minecraft.server.MinecraftServer
• net.minecraft.server.level.ChunkMap
• net.minecraft.server.level.ServerChunkCache
• net.minecraft.server.permissions.PermissionSet
• net.minecraft.server.permissions.Permissions
• net.minecraft.util.MemoryReserve
• net.minecraft.util.Util
• org.apache.commons.lang3.SystemUtils
• org.apache.logging.log4j.LogManager
• org.apache.logging.log4j.Logger
• JsonArray.spliterator()
• FabricLoader.isModLoaded()
• Minecraft.stop()
• ServerLevel.getChunkSource()
• ServerLevel.getServer()

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

A fork of ModernFix that adds minor version update support.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file modernfix-5.27.20-build.2.jar. The scan reads the mod's classes; it does not run them.