Migrate BedWar from Minecraft 1.8.9 Forge to NeoForge 1.21.1

[Copilot]

Migrates the entire mod from the legacy 1.8.9 Forge/architectury-loom stack to NeoForge 21.1.172 (Minecraft 1.21.1), Java 21, and Kotlin 2.0.0.

Build System

• Replace architectury-loom with net.neoforged.gradle.userdev (7.0.171)
• Remove MoulConfig (io.github.moulberry.moulconfig) and libautoupdate (moe.nea:libautoupdate) dependencies
• Add META-INF/mods.toml + pack.mcmeta (pack_format 34); remove mcmod.info

Event System

• MinecraftForge.EVENT_BUS → NeoForge.EVENT_BUS; all @SubscribeEvent imports updated to net.neoforged.bus.api
• @Cancelable annotation replaced with ICancellableEvent interface
• Tick/world events: ClientTickEvent.Pre, LevelEvent.Load; chat: ClientChatReceivedEvent; disconnect: ClientPlayerNetworkEvent.LoggingOut

Minecraft API

• Minecraft.getMinecraft() → Minecraft.getInstance(), .thePlayer → .player, .theWorld → .level, .fontRendererObj → .font
• IChatComponent / ChatComponentText → Component / MutableComponent
• ScaledResolution → Window.getGuiScaledWidth/Height()
• All net.minecraft.item.* / net.minecraft.init.* → net.minecraft.world.item.*

Rendering

• All rendering uses GuiGraphics (replacing GlStateManager direct calls); GuiRenderEvent and NotificationRenderEvent now carry a GuiGraphics instance
• GuiScreen → Screen; GuiPositionEditor rewritten using Screen's render, mouseClicked, keyPressed, mouseScrolled overrides
• HUD overlay via RenderGuiLayerEvent.Pre with VanillaGuiLayers.HOTBAR

Mixin Transformers

Old → new class targets: GuiContainer → AbstractContainerScreen, NetHandlerPlayClient → ClientPacketListener, NetworkManager → Connection, GuiPlayerTabOverlay → PlayerTabOverlay, ChatComponentText → LiteralContents. Mixin compatibility level set to JAVA_21.

Config System

MoulConfig removed; config now serialized directly via GSON to config/bedwar/config.json. All @ConfigOption/@ConfigEditorBoolean/@Accordion annotations stripped; @Expose retained for GSON. No config GUI in this iteration.

Commands

ClientCommandHandler.instance.registerCommand() replaced with Brigadier via RegisterClientCommandsEvent.

// Before (old Forge)
ClientCommandHandler.instance.registerCommand(SimpleCommand("bw") { ... })

// After (NeoForge 1.21.1)
@SubscribeEvent
fun onRegisterCommands(event: RegisterClientCommandsEvent) {
    event.dispatcher.register(
        LiteralArgumentBuilder.literal<CommandSourceStack>("bw")
            .executes { cmd.execute(emptyArray()); 1 }
    )
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• maven.neoforged.net
  • Triggering command: /usr/lib/jvm/temurin-17-jdk-amd64/bin/java /usr/lib/jvm/temurin-17-jdk-amd64/bin/java --add-opens=java.base/java.util=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.base/java.lang.invoke=ALL-UNNAMED --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED --add-opens=java.base/java.nio.charset=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED --add-opens=java.base/java.util.concurrent.atomic=ALL-UNNAMED -Xmx4g -Dfile.encoding=UTF-8 -Duser.country -Duser.language=en -Duser.variant -cp /home/REDACTED/.gradle/wrapper/dists/gradle-8.3-bin/dxjbbhstwasg8cbags9q7cvli/gradle-8.3/lib/gradle-launcher-8.3.jar -javaagent:/home/REDACTED/.gradle/wrapper/dists/gradle-8.3-bin/dxjbbhstwasg8cbags9q7cvli/gradle-8.3/lib/agents/gradle-instrumentation-agent-8.3.jar org.gradle.launcher.daemon.bootstrap.GradleDaemon 8.3 bash git (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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