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FermiumBooter

A simplistic mixin mod utility for loading early and late mixins
by fonnymunkey
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2,947,718 downloads
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Updated Jul 6, 2026
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API and Library Utility & QoL

FermiumBooter is a mixin mod utility to allow developers to load mixins both early and late, allowing for modifying classes that normally could not be modified otherwise.

Current features include;
- Enqueue mixins to be applied both early and late, to allow for for modifying Vanilla/Forge classes, as well as mod classes
- @MixinConfig annotation system to expand on the Forge @Config system, to allow for automatic mixin enqueue based on config toggles
- Optional compatibility handling through the config annotation system to allow developers to define required/incompatible mods for specific mixins
- Logged warnings when a mixin using the config annotation system fails compatibility checks
- Optional forced mixin disabling when a mixin using the config annotation system fails compatibility checks
- Ingame (disable-able) warning rendering when mixins using the config annotation system fail compatibility checks
- Enable/disable enqueued mixins prior to application through the use of a Supplier, to allow developer control over optional mixins
- Utility method to check if a ModID is present similar to Loader.isModLoaded() however usable during mixin enqueue/early mixin application unlike Loader.isModLoaded()
- Disallow other FermiumBooter enqueued mixins from applying, for testing or tweaking purposes

- Shadows Mixin 0.8.7 and MixinExtras 0.4.1

For developer usage:

In your IFMLLoadingPlugin init, instead of "Mixins.addConfiguration("mixinConfigName")", use "FermiumRegistryAPI.enqueueMixin("mixinConfigName").
If you are registering it as a late-loaded mixin use "FermiumRegistryAPI.enqueueMixin(true, "mixinConfigName")".
That is all that is required, and FermiumBooter takes care of the rest.
For additional utilities as described previously, all are documented in code with explanations of usage and purpose.


If you have any issues/suggestions/requests, please post them to the Github issue tracker linked above.


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FermiumBooter-1.0.0-1.20.1.jar
MC Client, 1.20.1, Forge, Server
Release 2026-06-22 Get
FermiumBooter-1.0.1.jar
MC Client, Forge, Server, 1.12.2
Beta 2024-03-16 Get

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