I'm working to support 1.17, but I have encountered some problems due to the change of mod loading system of Forge and bugs(?).
In this issue, I share the critical points, solutions and progress.

• Launch Minecraft with SLP(kotori_scala)

  • Currently I get crashes due to NPE, which means forge has bugs or there is more good way to load language provider.

• Develop with SLP

• Search why NPE occurred.

  • Because of lack of IModFileInfo. The instance should be created in loading mods, but the creation doesn't work for language providers.
    • This will be fixed in MinecraftForge/MinecraftForge#7947
  • I have to implement custom ModLocator to load my scala provider.
  • I have created some classes but another problem related to module system occurred.