MixinBooter

MixinBooter

The Mixin Library for 1.8 - 1.12.2.

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About this Mod

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");
    }
    
}

Available Versions

MixinBooter 11.6release
MC 1.8, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.8.8, 1.8.9, 1.9, 1.9.1, 1.9.2, 1.9.3, 1.9.4, 1.10, 1.10.1, 1.10.2, 1.11, 1.11.1, 1.11.2, 1.12, 1.12.1, 1.12.2forge
July 22, 2026
MixinBooter 11.5release
MC 1.8, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.8.8, 1.8.9, 1.9, 1.9.1, 1.9.2, 1.9.3, 1.9.4, 1.10, 1.10.1, 1.10.2, 1.11, 1.11.1, 1.11.2, 1.12, 1.12.1, 1.12.2forge
July 9, 2026
MixinBooter 11.4release
MC 1.8, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.8.8, 1.8.9, 1.9, 1.9.1, 1.9.2, 1.9.3, 1.9.4, 1.10, 1.10.1, 1.10.2, 1.11, 1.11.1, 1.11.2, 1.12, 1.12.1, 1.12.2forge
July 8, 2026
MixinBooter 11.3release
MC 1.8, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.8.8, 1.8.9, 1.9, 1.9.1, 1.9.2, 1.9.3, 1.9.4, 1.10, 1.10.1, 1.10.2, 1.11, 1.11.1, 1.11.2, 1.12, 1.12.1, 1.12.2forge
July 8, 2026
MixinBooter 11.2release
MC 1.8, 1.8.1, 1.8.2, 1.8.3, 1.8.4, 1.8.5, 1.8.6, 1.8.7, 1.8.8, 1.8.9, 1.9, 1.9.1, 1.9.2, 1.9.3, 1.9.4, 1.10, 1.10.1, 1.10.2, 1.11, 1.11.1, 1.11.2, 1.12, 1.12.1, 1.12.2forge
July 5, 2026

How to Install MixinBooter on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set forge Loader

In the panel under "Egg", select the forge loader and matching Minecraft version (1.12.2).

3

Install Mod

Open the mod browser in the dashboard and search for "MixinBooter". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

forge

Minecraft Versions

1.12.2, 1.12.1, 1.12 (+21 more)

Server-side

Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

MixinBooter server crashes on startup – what to do?

Most common cause: wrong forge version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.12.2). You can switch loaders with one click in the panel.

Is MixinBooter compatible with forge?

MixinBooter officially supports forge for Minecraft 1.12.2, 1.12.1, 1.12. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with MixinBooter – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if MixinBooter consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.

Rent Modded Server

Install MixinBooter with just one click on your server.

Recommended RAM
4 GBfrom €5.2/mo
Minimum 3 GB | per 8 players
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NVMe SSD Storage
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Details

License
GNU Lesser General Public License v2.1 only
Server-side
Required

Supported Versions

1.12.21.12.11.121.11.21.11.11.111.10.21.10.11.101.9.4+14 more