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Research / porting

Compatibility / Java

Modpack Porting.

Exploring how a large, older Minecraft modpack could move to version 1.21.1, with compatibility work across Java, mods, loaders and dependencies.

JavaMinecraft 1.21.1 targetMod loadersCompatibilityBuild tooling
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The challenge

A major version jump changes APIs, loader behavior and mod dependencies. It takes more than updating version numbers to bring an interconnected modpack onto a new game release.

Migration plan

Inventory modsMap dependenciesPort / replaceIntegration tests

The 1.21.1 port is in the research and compatibility stage.

Technical focus

  • Java and the differences between Minecraft versions.
  • Compatibility across mod loaders and their APIs.
  • Dependency mapping, build tooling and incremental integration.
  • Separating code that can be ported from components requiring replacements.

Next steps

Continue evaluating the port one dependency at a time, then test integrated builds as compatible components become available.