PIpie_flavor·Oct 30, 2025
I don't know where you'd use it besides modding, but it is a general-purpose framework: https://github.com/SpongePowered/Mixin
In Minecraft removing obfuscation in Java EditionSpongePowered
Mixin
Java2016–2025
SpongePowered / Mixin
Mixin
Mixin is a trait/mixin and bytecode weaving framework for Java using ASM
7Distinct people
8Mentions
0Explicit recommenders
1.7KGitHub stars
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What it is
Mixin is a trait/mixin and bytecode weaving framework for Java using ASM
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This week on Hacker News
Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 3:03:16 PM UTC.
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HN mentions by year8 dated mentions
Observed mentions: 2016-07-14 01:33:34 UTC to 2025-10-30 15:22:47 UTC.
Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.
View mention counts and date ranges
| Period | Start (UTC) | End (exclusive, UTC) | Mentions | Submissions | Comments |
|---|---|---|---|---|---|
| 2016 | 2016-01-01 00:00:00 UTC | 2017-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2017 | 2017-01-01 00:00:00 UTC | 2018-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2018 | 2018-01-01 00:00:00 UTC | 2019-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2019 | 2019-01-01 00:00:00 UTC | 2020-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2020 | 2020-01-01 00:00:00 UTC | 2021-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2021 | 2021-01-01 00:00:00 UTC | 2022-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2022 | 2022-01-01 00:00:00 UTC | 2023-01-01 00:00:00 UTC | 1 | 0 | 1 |
| 2023 | 2023-01-01 00:00:00 UTC | 2024-01-01 00:00:00 UTC | 0 | 0 | 0 |
| 2024 | 2024-01-01 00:00:00 UTC | 2025-01-01 00:00:00 UTC | 1 | 1 | 0 |
| 2025 | 2025-01-01 00:00:00 UTC | 2026-01-01 00:00:00 UTC | 4 | 1 | 3 |
What Hacker News says
8 sourcesVery niche but: https://github.com/SpongePowered/Mixin
It's not really possible to implement in the same way for many other languages, but something like this but for source code transformations (rather than bytecode, or machine code for compiled languages) is probably the kind of thing they're thinking of.
Mixin allows you to insert code into methods, modify calls to functions, read/write to local variables, modify constants, and a lot more in that type of vein. It is the way mods are made in the Fabric mod loader for Minecraft. I believe Forge also reluctantly added support for Mixin back in 1.16 or so.
In LumoSQLThe funny thing about Java is that while its design is to be entirely nominally typed, the way it is implemented in the JVM is compatible with structural typing, but there are artificial limitations set to follow the intended design (though of course, if one were to disable these limitations then modeled type safety goes out of the window as Java was simply not designed to be used that way). One community which takes advantage of this fact is the Minecraft modding space, as it is the basis[1] of how modding platforms like Fabric work.
1: https://github.com/SpongePowered/Mixin/wiki/Introduction-to-...
In Exploring Polymorphism in C: Lessons from Linux and FFmpeg's Code Design (2019)Mixin is a trait/mixin and bytecode weaving framework for Java using ASM
54 points · Open discussionThese days Mojang provides obfuscation maps, so you can work with proper class and method names (though no parameter or local variable names). There's also been a lot of effort been put into the tooling. Nowadays there exists Gradle plugins that will download the game jar, decompile it and deobfuscate it using the official mappings. You develop against the deobfuscated code, then the plugin will turn the unobfuscated names back into their obfuscated versions when you compile.
There's also been technology developed that lets you easily modify specific parts of a method in the game, so you can e.g. insert calls to your own functions at runtime.[1] This saves from you having to modify the game jar itself.
[1]: https://github.com/SpongePowered/Mixin
In Scratch is a big dealIn retrospect, we can all agree that 1 in fact does not equal 3
1 points · Open discussionDecently interesting mixin system for Java
1 points · Open discussion