McJtyLib

Calls something that is on Kiln's roadmap. Parts of it may already run.

Evidence

Ran on Kiln's test stand (2026-11-04): McJtyLib did not start: java.lang.NoClassDefFoundError: net/fabricmc/fabric/api/attachment/v1/AttachmentTarget; ClientSetup did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/screens/inventory/tooltip/ClientTooltipComponent.

What it needs from Kiln

an access widener
Mixin
com.mojang.authlib.GameProfile
com.mojang.blaze3d.platform.TextInputManager
com.mojang.blaze3d.platform.Window
com.mojang.blaze3d.vertex.PoseStack
com.mojang.blaze3d.vertex.PoseStack.Pose
com.mojang.blaze3d.vertex.VertexConsumer
com.mojang.math.Axis
com.mojang.renderpearl.api.pipeline.BlendFunction
com.mojang.renderpearl.api.pipeline.ColorTargetState
com.mojang.renderpearl.api.pipeline.CompareOp
com.mojang.renderpearl.api.pipeline.DepthStencilState
com.mojang.renderpearl.api.pipeline.RenderPipeline
com.mojang.renderpearl.api.pipeline.RenderPipeline.Builder
com.mojang.renderpearl.api.pipeline.RenderPipeline.Snippet
io.netty.buffer.ByteBuf
io.netty.buffer.Unpooled
net.fabricmc.fabric.api.attachment.v1.AttachmentRegistry
net.fabricmc.fabric.api.attachment.v1.AttachmentRegistry.Builder
net.fabricmc.fabric.api.attachment.v1.AttachmentTarget
net.fabricmc.fabric.api.attachment.v1.AttachmentType
net.fabricmc.fabric.api.client.item.v1.ItemTooltipCallback
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.Context
net.fabricmc.fabric.api.client.networking.v1.ClientPlayNetworking.PlayPayloadHandler
net.fabricmc.fabric.api.client.rendering.v1.ClientTooltipComponentCallback
net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderContext
net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderEvents
net.fabricmc.fabric.api.client.rendering.v1.level.LevelRenderEvents.CollectSubmits
net.fabricmc.fabric.api.client.screen.v1.ScreenEvents
net.fabricmc.fabric.api.client.screen.v1.ScreenEvents.AfterInit
net.fabricmc.fabric.api.client.screen.v1.ScreenKeyboardEvents
net.fabricmc.fabric.api.client.screen.v1.ScreenKeyboardEvents.AllowCharType
net.fabricmc.fabric.api.client.screen.v1.ScreenKeyboardEvents.AllowKeyPress
net.fabricmc.fabric.api.client.screen.v1.ScreenMouseEvents
net.fabricmc.fabric.api.client.screen.v1.ScreenMouseEvents.AllowMouseClick
net.fabricmc.fabric.api.client.screen.v1.ScreenMouseEvents.AllowMouseDrag
net.fabricmc.fabric.api.client.screen.v1.ScreenMouseEvents.AllowMouseRelease
net.fabricmc.fabric.api.client.screen.v1.ScreenMouseEvents.AllowMouseScroll
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarting
and 81 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

Library mod used by most mods by McJty and romelo333 (RFTools, XNet, Deep Resonance, Not Enough Wands, SignTastic, etc.)

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file mcjtylib-fabric-26.3-11.0.3-fabric.jar. The scan reads the mod's classes; it does not run them.

Reports from players

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