JustHelper

Evidence

Ran on Kiln's test stand (2026-11-04): JustHelperClient did not start: java.lang.NoClassDefFoundError: net/minecraft/world/entity/EquipmentSlotGroup.

What it needs from Kiln

• Mixin
• com.mojang.authlib.GameProfile
• com.mojang.authlib.properties.Property
• com.mojang.authlib.properties.PropertyMap
• com.mojang.blaze3d.platform.Window
• net.fabricmc.loader.api.ModContainer
• net.fabricmc.loader.api.Version
• net.fabricmc.loader.api.metadata.ModMetadata
• net.minecraft.client.User
• net.minecraft.client.gui.components.AbstractScrollArea
• net.minecraft.client.gui.components.AbstractScrollArea.ScrollbarSettings
• net.minecraft.client.gui.components.AbstractTextAreaWidget
• net.minecraft.client.gui.components.AbstractWidget
• 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.ImageButton
• net.minecraft.client.gui.components.ItemDisplayWidget
• net.minecraft.client.gui.components.MultiLineEditBox
• net.minecraft.client.gui.components.MultiLineEditBox.Builder
• net.minecraft.client.gui.components.MultiLineTextWidget
• net.minecraft.client.gui.components.MultilineTextField
• net.minecraft.client.gui.components.StringWidget
• net.minecraft.client.gui.components.Tooltip
• net.minecraft.client.renderer.block.BlockStateModelSet
• net.minecraft.client.renderer.block.dispatch.BlockStateModel
• net.minecraft.client.renderer.chunk.SectionRenderDispatcher
• net.minecraft.client.renderer.chunk.SectionRenderDispatcher.RenderSection
• net.minecraft.client.renderer.texture.SpriteContents
• net.minecraft.client.renderer.texture.TextureAtlasSprite
• net.minecraft.client.resources.model.ModelManager
• net.minecraft.client.resources.model.sprite.Material
• net.minecraft.client.resources.model.sprite.Material.Baked
• net.minecraft.commands.CommandBuildContext
• net.minecraft.commands.arguments.IdentifierArgument
• net.minecraft.commands.arguments.ResourceArgument
• net.minecraft.core.HolderLookup.RegistryLookup
• net.minecraft.core.HolderSet
• net.minecraft.core.HolderSet.Direct
• net.minecraft.core.RegistryAccess
• net.minecraft.core.component.DataComponentType
• and 81 more

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

That helps you in developing code on JustMC

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file just-helper-12.10.26.jar. The scan reads the mod's classes; it does not run them.