Forgelin: Legacy
by FalsePattern
Forgelin: Legacy is a Forge library for 1.7.10 that supplies Kotlin support to other mods, bundled with its own runtime.
What it does
Forgelin: Legacy is a Forge library that other mods use to run Kotlin code on Minecraft 1.7.10. Mod authors build on it, and it adds no game features of its own. It provides a Forge language adapter that lets a mod's main class be a Kotlin object, and it supplies coroutine dispatchers for the server and client ticks, named Dispatchers.MinecraftServer and Dispatchers.MinecraftClient. The Kotlin libraries are updated to the 2.x line and can be fetched at runtime through FPLib DepLoader, which keeps the mod jar much smaller.
The library is by FalsePattern and is open source under the GNU Lesser General Public License v3.0 only, with a public source code repository and issue tracker. It is a Forge file for 1.7.10 only, with the latest file 2.4.3-2.4.10 dated 2026-08-09. Forgelin: Legacy is bundled with GTNH's Forgelin inside the jar and is required by Better Foliage - Legacy Edition and Vintage Resourcify. It works with Kotlin support, and either side can run it, so neither the server nor the client needs it.
Key features
Kotlin language adapter
A Forge language adapter lets a mod's main class be written as a Kotlin object.
Server and client dispatchers
Dispatchers.MinecraftServer and Dispatchers.MinecraftClient run coroutines during the server tick and the client tick.
Runtime Kotlin fetching
Kotlin libraries are fetched on demand through FPLib DepLoader, so the mod jar stays small.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Embedded 1
Required by 2 mods
Use cases
Mod development
Authors of 1.7.10 mods write Kotlin code on top of this library, then depend on it in their build.
Library dependency
Mods such as Better Foliage - Legacy Edition and Vintage Resourcify declare it as a required dependency.
Who it’s for: Mod developers working on Minecraft 1.7.10 who want Kotlin in their projects. Players do not interact with the library directly.
How it compares
GTNH's Forgelin is the bundled original, with the same Forge loader and 1.7.10 version, client and server environment, and GNU Lesser General Public License v3.0 only license. retroforgelin is a Forge build for 1.7.10 with the same optional environment, under GNU Lesser General Public License v3.0 or later. Mongo Runtime is Forge-only for 1.12.2, optional on either side, and is not open source, under Creative Commons Attribution Share Alike 4.0.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Forgelin: Legacy | Forge | 1.7.10 | Client or server, optional | 2026-08-09 |
| GTNH's Forgelin | Forge | 1.7.10 | Client and server | 2025-11-23 |
| retroforgelin | Forge | 1.7.10 | Client or server, optional | 2023-12-09 |
| Mongo Runtime | Forge | 1.12.2 | Client or server, optional | 2024-11-22 |
Questions
Does Forgelin: Legacy need to be installed on both sides?
Which mods need Forgelin: Legacy?
Is Forgelin: Legacy the same as GTNH's Forgelin?
In the catalog
Forgelin: Legacy is one of 3,514 Library mods on ModsFinder, and one of 1,576 Library mods for Forge. 1,013 mods support Minecraft 1.7.10.
More from FalsePattern
Similar mods
What the author says
This is a library mod designed to be used by other mods. It doesn't add any game features by itself, and is purely an API. The kotlin version that forgelin downloads is always in the suffix after the - in the version number
Official listing
- Modrinth page
- modrinth.com/mod/forgelin-legacy
- Owner
- FalsePattern
- Published
- 2025-11-23
- Updated on Modrinth
- 2026-08-09
- Facts verified
- 2026-10-15