FFWaterFalls

Evidence

Ran on Kiln's test stand (2026-11-04): FabricEntrypoint did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/material/Fluid; FabricClientEntrypoint did not start: java.lang.NoClassDefFoundError: net/minecraft/client/gui/screens/options/OptionsSubScreen.

What it needs from Kiln

• Mixin
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents.Load
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerChunkEvents.Unload
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLevelEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLevelEvents.Unload
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStopped
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerTickEvents.EndLevelTick
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents
• net.fabricmc.fabric.api.event.player.PlayerBlockBreakEvents.After
• net.minecraft.core.BlockPos.MutableBlockPos
• net.minecraft.world.level.ChunkPos
• net.minecraft.world.level.block.LiquidBlock
• net.minecraft.world.level.block.SimpleWaterloggedBlock
• net.minecraft.world.level.chunk.ChunkAccess
• net.minecraft.world.level.chunk.LevelChunk
• net.minecraft.world.level.chunk.status.ChunkStatus
• net.minecraft.world.level.material.FlowingFluid
• net.minecraft.world.level.material.Fluid
• net.minecraft.world.level.material.FluidState
• net.minecraft.world.level.material.Fluids
• net.minecraft.client.gui.screens.options.OptionsSubScreen
• BlockPos.asLong()
• BlockPos.getX()
• BlockPos.getZ()
• BlockPos.mutable()
• BlockPos.of()
• BuiltInRegistries.FLUID
• ServerLevel.getMaxY()
• ServerLevel.getMinY()
• Level.getChunk()
• Level.hasChunk()
• LevelAccessor.getBlockState()
• LevelAccessor.isClientSide()
• BlockState.canBeReplaced()
• BlockState.getFluidState()

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

Adds gravity to fluids. Supports modded fluids and allows liquids to fall through waterloggable blocks. Can restrict vertical fall limit to fluid spread distance.

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file ffwaterfalls-0.4.0+26.3-fabric.jar. The scan reads the mod's classes; it does not run them.