Mariposa

Evidence

Ran on Kiln's test stand (2026-11-04): Mariposa did not start: java.lang.NoClassDefFoundError: net/minecraft/world/item/BoatItem; MariposaClient did not start: java.lang.NoClassDefFoundError: net/minecraft/client/renderer/entity/EntityRenderer.

What it needs from Kiln

• net.fabricmc.fabric.api.client.rendering.v1.ModelLayerRegistry
• net.fabricmc.fabric.api.client.rendering.v1.ModelLayerRegistry.TexturedLayerDefinitionProvider
• net.fabricmc.fabric.api.item.v1.BlockTransformerHelper
• net.fabricmc.fabric.api.object.builder.v1.block.type.BlockSetTypeBuilder
• net.fabricmc.fabric.api.object.builder.v1.block.type.WoodTypeBuilder
• net.minecraft.client.model.geom.ModelLayerLocation
• net.minecraft.client.model.object.boat.BoatModel
• net.minecraft.client.renderer.entity.BoatRenderer
• net.minecraft.client.renderer.entity.EntityRendererProvider
• net.minecraft.client.renderer.entity.EntityRendererProvider.Context
• net.minecraft.client.renderer.entity.EntityRenderers
• net.minecraft.core.BlockPos.MutableBlockPos
• net.minecraft.core.HolderGetter
• net.minecraft.core.RegistryAccess
• net.minecraft.core.particles.ColorParticleOption
• net.minecraft.core.particles.ParticleTypes
• net.minecraft.data.worldgen.BiomeDefaultFeatures
• net.minecraft.data.worldgen.BlockStateProviders
• net.minecraft.data.worldgen.BootstrapContext
• net.minecraft.data.worldgen.biome.OverworldBiomes
• net.minecraft.data.worldgen.material.VanillaMaterialConditions
• net.minecraft.data.worldgen.placement.PlacementUtils
• net.minecraft.data.worldgen.placement.TreePlacements
• net.minecraft.data.worldgen.placement.VegetationPlacements
• net.minecraft.references.BlockItemId
• net.minecraft.server.MinecraftServer
• net.minecraft.tags.BlockTags
• net.minecraft.util.ParticleUtils
• net.minecraft.util.random.WeightedList
• net.minecraft.util.valueproviders.ConstantInt
• net.minecraft.util.valueproviders.UniformInt
• net.minecraft.world.attribute.BackgroundMusic
• net.minecraft.world.attribute.EnvironmentAttributes
• net.minecraft.world.entity.EntityType
• net.minecraft.world.entity.EntityType.Builder
• net.minecraft.world.entity.EntityType.EntityFactory
• net.minecraft.world.entity.EntityTypes
• net.minecraft.world.entity.MobCategory
• net.minecraft.world.entity.vehicle.boat.Boat
• net.minecraft.world.entity.vehicle.boat.ChestBoat
• and 67 more

On the roadmap: Minecraft's libraries and client API (0.2), Code next to data (0.3)

In the author's words

Giant sequoia forests inspired by Mariposa Grove

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file Mariposa-fabric-1.3.3-26.3.jar. The scan reads the mod's classes; it does not run them.