Dynmap — NeoForge 1.21.1 Port

Port of Dynmap to NeoForge 21.1.219 / Minecraft 1.21.1.

This standalone build is used for deployment on an ATM10 server. The goal is to eventually submit this as a PR back to the upstream webbukkit/dynmap repository.

• Upstream: https://github.com/webbukkit/dynmap (branch: neoforge)
• Fork (for PR): https://github.com/Cobbert/dynmap
• Gitea (this repo): Sulkta-Coop/dynmap-neoforge, branch neoforge-1.21.1

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Building

Requires Java 21 and Docker (build container: dynmap-neoforge-build).

# Inside build container
cd /workspace
./gradlew shadowJar --no-daemon

Output: build/libs/Dynmap-neoforge-1.21.1-3.7-SNAPSHOT-Dev-all.jar

Memory notes

• Gradle daemon heap: capped at -Xmx2g (see gradle.properties)
• forked javac: capped at -Xmx3g (see build.gradle)
• Without these caps, JVM defaults to 25% of host RAM — causes OOM on high-RAM hosts

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Changes from upstream neoforge-1.20.6

See CHANGES.md for the full changelog.

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Test status

Environment	Result
Vanilla NeoForge 1.21.1 (clean server)	✅ Passes
ATM10 5.5 (445 mods, NeoForge 21.1.219)	✅ Passes

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Deployment

Copy the fat jar into the server's mods/ directory. Remove any old Dynmap*.jar first.

docker cp build/libs/Dynmap-neoforge-1.21.1-3.7-SNAPSHOT-Dev-all.jar <container>:/data/mods/

Note: Always remove old jars before copying a new one. The container data volume may retain old versions.

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Containers (internal, Lucy/Unraid)

Container	Purpose	Ports
dynmap-neoforge-build	Gradle build environment	—
neoforge-test	Vanilla NeoForge 1.21.1 test server	25566 (MC), 8124 (web)
atm10-55-test	ATM10 5.5 test server, 445 mods	—
a6860a8008ed (prod)	Production ATM10 — DO NOT TOUCH	—

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PR Plan

Once ATM10 testing is confirmed:

1. Mirror all changes to monorepo (dynmap-upstream/neoforge-1.21.1/)
2. Push to Cobbert/dynmap fork on GitHub
3. Open PR: Cobbert/dynmap:neoforge-1.21.1 → webbukkit/dynmap:neoforge

PR description draft is in DYNMAP.md (workspace copy).