Personal Borders

Evidence

Ran on Kiln's test stand (2026-11-04): PersonalBorders did not start: java.lang.NoClassDefFoundError: net/minecraft/world/level/border/WorldBorder.

What it needs from Kiln

• an access widener
• Mixin
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents
• net.fabricmc.fabric.api.event.lifecycle.v1.ServerLifecycleEvents.ServerStarted
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents
• net.fabricmc.fabric.api.networking.v1.ServerPlayConnectionEvents.Join
• net.minecraft.core.GlobalPos
• net.minecraft.network.protocol.game.ClientboundInitializeBorderPacket
• net.minecraft.server.MinecraftServer
• net.minecraft.server.network.ServerGamePacketListenerImpl
• net.minecraft.server.players.PlayerList
• net.minecraft.world.entity.EntityReference
• net.minecraft.world.entity.OwnableEntity
• net.minecraft.world.entity.projectile.Projectile
• net.minecraft.world.level.border.WorldBorder
• net.minecraft.world.level.levelgen.Heightmap
• net.minecraft.world.level.levelgen.Heightmap.Types
• net.minecraft.world.level.storage.LevelData
• net.minecraft.world.level.storage.LevelData.RespawnData
• org.apache.logging.log4j.Level
• org.apache.logging.log4j.LogBuilder
• org.apache.logging.log4j.LogManager
• org.apache.logging.log4j.Logger
• ServerLevel.getWorldBorder()
• ServerPlayer.connection
• Entity.getPassengers()
• Entity.isVehicle()
• Level.getHeightmapPos()
• Level.getWorldBorder()

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

Mod that adds player-specific borders

Scan

Scanned on 4 November 2026 against Kiln 0.2.0, file personal-borders-fabric-mc26.3-1.1.0.jar. The scan reads the mod's classes; it does not run them.