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GroovyModLoader (GML) Mod for Minecraft 1.20.1, 1.21.1

A language provider for Forge Groovy mods.

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Updated
Updated 26.10.2026

About the GroovyModLoader (GML) mod

Used to make mods with the Groovy programming language. Works by JiJ'ing the Groovy libraries, providing GMLLangProvider to load @GMod object declarations.

Included Groovy modules:

stdlib, contracts, datetime, nio, macro, macro-library, templates, typecheckers, dateutil, ginq, toml, json.

For modders, see the project README on how to use GML. For users, just install the mod in the mods folder.

How to install GroovyModLoader (GML)

With Millida Launcher

  1. Install Millida Launcher

    The launcher is free: download it at millida.net/launcher and sign in with any nickname.

  2. Click “Install” on this page

    The launcher opens and installs the mod for Minecraft 1.19.4–1.21.1 on Forge or NeoForge automatically.

  3. Launch the game

    A profile with it appears in the launcher: click “Play”.

Manually

  1. Install Forge or NeoForge

    The loader must match the game version of the mod file, for example Minecraft 1.21.1. After installing it, a separate profile appears in your launcher.

  2. Download the file for your version

    In the version list above, pick the file gml-6.0.2.jar (10 MB) for your game version and loader.

  3. Put it in the mods folder

    The folder is inside .minecraft (Windows: %appdata%\.minecraft\mods). If it does not exist, create it.

  4. Launch the loader profile

    Open “Mods” in the main menu: GroovyModLoader (GML) should be in the list.

Minecraft 1.21.1 runs on Java 21: with a different Java version the game may close right after launch.

Versions

With dependencies

MinecraftLoaderFileDateActions
1.20.1Forgegml-4.0.1110.6 MB
1.21NeoForgegml-6.0.210.5 MB 4
1.19.4Forgegml-3.1.010.4 MB

FAQ

Which Minecraft versions does GroovyModLoader (GML) work on?

There are files for 1.21.1, 1.21, 1.20.1, 1.20, 1.19.4. The newest is 1.21.1.

Is GroovyModLoader (GML) for Forge or Fabric?

There are files for Forge: 1.19.4–1.20.1 and for NeoForge: 1.21–1.21.1. There are no files for Fabric: a mod for another loader will not start.

Does GroovyModLoader (GML) need other mods?

The author lists no required dependencies: the Forge or NeoForge loader is enough.

Which Java does GroovyModLoader (GML) need?

Minecraft 1.21.1 runs on Java 21. If the game closes right after launch, the usual cause is the wrong Java version in the profile settings.

Where can I download GroovyModLoader (GML) safely?

On this page: the file gml-6.0.2.jar (10 MB) is stored on Millida’s server, with no link shorteners. SHA-1 checksum: 29a8153c54b9b03a3b4b42be7d77fe4ac2459720.

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