Animal Pens

Evidence

Ran on Kiln's test stand (2026-11-04): AnimalPenFabric did not start: java.lang.NoClassDefFoundError: net/minecraft/server/packs/resources/PreparableReloadListener; AnimalPenFabricClient did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/render/pip/PictureInPictureRenderer.

What it needs from Kiln

• an access widener
• Mixin
• com.mojang.blaze3d.platform.Lighting
• com.mojang.blaze3d.platform.Lighting.Entry
• com.mojang.blaze3d.vertex.PoseStack
• com.mojang.math.Axis
• com.mojang.renderpearl.api.pipeline.RenderPipeline
• net.fabricmc.fabric.api.client.rendering.v1.BlockColorRegistry
• net.fabricmc.fabric.api.client.rendering.v1.PictureInPictureRendererRegistry
• net.fabricmc.fabric.api.client.rendering.v1.PictureInPictureRendererRegistry.Context
• net.fabricmc.fabric.api.client.rendering.v1.PictureInPictureRendererRegistry.Factory
• net.fabricmc.fabric.api.command.v2.CommandRegistrationCallback
• net.fabricmc.fabric.api.event.player.UseBlockCallback
• net.fabricmc.fabric.api.item.v1.BlockTransformerEvents
• net.fabricmc.fabric.api.item.v1.BlockTransformerEvents.Modify
• net.fabricmc.fabric.api.item.v1.ResourceSource
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
• net.fabricmc.fabric.api.resource.v1.ResourceLoader
• net.minecraft.advancements.predicates.ItemPredicate
• net.minecraft.advancements.predicates.ItemPredicate.Builder
• net.minecraft.advancements.predicates.entity.EntityPredicate
• net.minecraft.advancements.predicates.entity.EntityPredicate.Builder
• net.minecraft.advancements.triggers.BredAnimalsTrigger
• net.minecraft.advancements.triggers.CriteriaTriggers
• net.minecraft.advancements.triggers.FilledBucketTrigger
• net.minecraft.advancements.triggers.KilledTrigger
• net.minecraft.advancements.triggers.PlayerInteractTrigger
• net.minecraft.advancements.triggers.SimpleCriterionTrigger
• net.minecraft.advancements.triggers.SimpleCriterionTrigger.SimpleInstance
• net.minecraft.client.color.block.BlockTintSource
• net.minecraft.client.gui.Font.DisplayMode
• net.minecraft.client.gui.components.AbstractButton
• net.minecraft.client.gui.components.AbstractSliderButton
• net.minecraft.client.gui.components.Button
• net.minecraft.client.gui.components.Button.Builder
• net.minecraft.client.gui.components.Button.CreateNarration
• net.minecraft.client.gui.components.Button.OnPress
• net.minecraft.client.gui.components.EditBox
• net.minecraft.client.gui.narration.NarratedElementType
• net.minecraft.client.gui.narration.NarrationElementOutput
• net.minecraft.client.gui.render.pip.PictureInPictureRenderer
• 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

Reduce lag and keep your animals neatly stored while maintaining full interactivity!

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file animal_pen-fabric-26.3-2.5.2.jar. The scan reads the mod's classes; it does not run them.