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MixinBooter
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MixinBooter

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0.5★ 5★

The Mixin Library for 1.8 - 1.12.2.

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5.0

Never had any issues

smeagle-0

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Contributor 100 pts ←
Guide 500 pts
Veteran 1,500 pts
Luminary 4,000 pts

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Posted: June 1, 2026 at 6:18:40 AM UTC
MC 1.12
The version(s) the reviewer played
Performance
4.5

Lets mods from 1.8 to 1.12.2 use mixins in the same way newer versions can. Also lets you uninstall MixinBootstrap as it has compatibility for it.

1
0
Last edited: June 2, 2026 at 8:10:22 PM UTC
MixinBooter
5.0

Never had any issues

smeagle-0

Reputation ranks

Explorer 0 pts
Contributor 100 pts ←
Guide 500 pts
Veteran 1,500 pts
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Posted: June 1, 2026 at 6:18:40 AM UTC
MC 1.12
The version(s) the reviewer played
Performance
4.5

Lets mods from 1.8 to 1.12.2 use mixins in the same way newer versions can. Also lets you uninstall MixinBootstrap as it has compatibility for it.

1
0
Last edited: June 2, 2026 at 8:10:22 PM UTC
5.0
smeagle-0

Reputation ranks

Explorer 0 pts
Contributor 100 pts ←
Guide 500 pts
Veteran 1,500 pts
Luminary 4,000 pts

Ranks only ever go up; points can drop but your rank stays.

About reputation ranks
Posted: June 1, 2026 at 6:18:40 AM UTC
MC 1.12
The version(s) the reviewer played
1
0

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CurseForge logo CurseForge Modrinth logo Modrinth

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About

Project Details

Type
Mod
License
GNU Lesser General Public License v2.1 only
Latest Version
MixinBooter 11.5
Authors
CurseForge
Modrinth

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About

Description

MixinBooter

Allows any mixins that work on mods to work effortlessly on 1.8 - 1.12.2

Pseudo-Changelog:

  • As of 4.2, MixinBooter's API has changed and all mods that uses mixins are encouraged to depend on MixinBooter, even those that mixin into vanilla/forge/library classes. To avoid mixin version mismatches with mods crashing trying to implement modded mixins (looking at you VanillaFix). Thanks to @embeddedt recommending and helping me introduce this change!

  • As of 5.0, MixinExtras by @LlamaLad7 is shaded. Available for developers to use.

  • As of 8.0, MixinBooter will now work from 1.8 - 1.12.2. One single build works with all these versions! (TODO: LiteLoader support?)

  • As of 8.4, MixinBooter actively attempts to be compatible with SpongeForge

  • As of 9.2, MixinBooter reinstates the older MixinLoader annotation for 1.8.x usages.

  • As of 10.0, MixinBooter follows Mixin 0.8.7

  • As of 11.0, MixinBooter is built on CleanMix. As an effort to create an unified backend with Cleanroom.

    • No longer would you need to declare dependencies for the annotation processor yourself.
    • Also adds a config file (config/mixinbooter.cfg) to blacklist mixin configs and toggle debug options
    • Dedicated logs/mixinbooter.log mixin log. With ability to trace class-loading for precise debugging.
    • Allows traditional MixinConfig + MixinConnector manifest attribute entries to be fully involved in the ecosystem
    • Mod discovery for mixin owners, better isModLoaded checks
    • Suppresses Forge's corrupt zip warnings
    • Phased out mixin "phases"

For Developers ~ Getting Started:

  1. Add CleanroomMC's repository and depend on MixinBooter's maven entry:
repositories {
    maven {
        url 'https://maven.cleanroommc.com'
    }
}

dependencies {
    def mixin = 'zone.rong:mixinbooter:11.0'

    implementation (mixin) {
        transitive = false
    }
    annotationProcessor mixin

    // RetroFuturaGradle for refmap generation:
    modUtils.enableMixins(mixin)
    // modUtils.enableMixins(mixin, 'mod_id.mixins.refmap.json') << add refmap name as 2nd arg (optional)
}
  1. Pick how to register your mixin configurations. MixinBooter supports lots of approaches:

(As of 11.0, early/late divide is no longer present, therefore IEarly/ILateMixinLoaders are deprecated)

  • MixinConfigs manifest attribute: no loader class needed. Add a space-separated list of your mixin configuration names to your jar's manifest. MixinBooter reads it straight from the jar's manifest and registers them.
  • MixinConnector manifest attribute: register configs programmatically. Point it at a class implementing org.spongepowered.asm.mixin.connect.IMixinConnector, its connect() is called during boot, where you call Mixins.addConfiguration(...) yourself.

Both manifest attributes are set on your jar task:

jar {
    manifest {
        attributes(
                'MixinConfigs': 'mixins.mymod.json',
                'MixinConnector': 'com.example.mymod.MyMixinConnector'
        )
    }
}
public class MyMixinConnector implements IMixinConnector {

    @Override
    public void connect() {
        // Check if mod is loaded before registering?
        // Possible with zone.rong.mixinbooter.service.ModDiscoverer.isModPresent(String modId)
        Mixins.addConfiguration("mixins.mymod.json");
    }

}

MixinBooter

Allows any mixins that work on mods to work effortlessly on 1.8 - 1.12.2

Pseudo-Changelog:

  • As of 4.2, MixinBooter's API has changed and all mods that uses mixins are encouraged to depend on MixinBooter, even those that mixin into vanilla/forge/library classes. To avoid mixin version mismatches with mods crashing trying to implement modded mixins (looking at you VanillaFix). Thanks to @embeddedt recommending and helping me introduce this change!

  • As of 5.0, MixinExtras by @LlamaLad7 is shaded. Available for developers to use.

  • As of 8.0, MixinBooter will now work from 1.8 - 1.12.2. One single build works with all these versions! (TODO: LiteLoader support?)

  • As of 8.4, MixinBooter actively attempts to be compatible with SpongeForge

  • As of 9.2, MixinBooter reinstates the older MixinLoader annotation for 1.8.x usages.

  • As of 10.0, MixinBooter follows Mixin 0.8.7

  • As of 11.0, MixinBooter is built on CleanMix. As an effort to create an unified backend with Cleanroom.

    • No longer would you need to declare dependencies for the annotation processor yourself.
    • Also adds a config file (config/mixinbooter.cfg) to blacklist mixin configs and toggle debug options
    • Dedicated logs/mixinbooter.log mixin log. With ability to trace class-loading for precise debugging.
    • Allows traditional MixinConfig + MixinConnector manifest attribute entries to be fully involved in the ecosystem
    • Mod discovery for mixin owners, better isModLoaded checks
    • Suppresses Forge's corrupt zip warnings
    • Phased out mixin "phases"

For Developers ~ Getting Started:

  1. Add CleanroomMC's repository and depend on MixinBooter's maven entry:
repositories {
    maven {
        url 'https://maven.cleanroommc.com'
    }
}

dependencies {
    def mixin = 'zone.rong:mixinbooter:11.0'
    
    implementation (mixin) {
        transitive = false
    }
    annotationProcessor mixin

    // RetroFuturaGradle for refmap generation:
    modUtils.enableMixins(mixin)
    // modUtils.enableMixins(mixin, 'mod_id.mixins.refmap.json') << add refmap name as 2nd arg (optional)
}
  1. Pick how to register your mixin configurations. MixinBooter supports lots of approaches:

(As of 11.0, early/late divide is no longer present, therefore IEarly/ILateMixinLoaders are deprecated)

  • MixinConfigs manifest attribute: no loader class needed. Add a space-separated list of your mixin configuration names to your jar's manifest. MixinBooter reads it straight from the jar's manifest and registers them.
  • MixinConnector manifest attribute: register configs programmatically. Point it at a class implementing org.spongepowered.asm.mixin.connect.IMixinConnector, its connect() is called during boot, where you call Mixins.addConfiguration(...) yourself.

Both manifest attributes are set on your jar task:

jar {
    manifest {
        attributes(
                'MixinConfigs': 'mixins.mymod.json',
                'MixinConnector': 'com.example.mymod.MyMixinConnector'
        )
    }
}

public class MyMixinConnector implements IMixinConnector {
    
    @Override
    public void connect() {
        // Check if mod is loaded before registering?
        // Possible with zone.rong.mixinbooter.service.ModDiscoverer.isModPresent(String modId)
        Mixins.addConfiguration("mixins.mymod.json");
    }
    
}

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