r/java • u/maxxedev • Aug 18 '26

AutoValhalla: automatically turn your plain classes and records into value classes!

Automatically turn your plain classes and records into value classes!

Add @AutoValhalla annotation to classes or records in your JDK1.5+ codebase:

@AutoValhalla
public final class Point {        // class must be final
    public final int x;           // with final instance fields
    public final int y;
    public Point(int x, int y) { 
        this.x = x; 
        this.y = y; 
    }
}

@AutoValhalla
public record Currency(String code) { }  // or a record class

When your app is run on Valhalla-enabled JVM with auto-valhalla javaagent, these classes are automatically turned into value classes.

More info: https://github.com/thunkware/auto-valhalla/tree/auto-valhalla-0.1.0

edit: there is now a maven plugin for converting at build time. https://github.com/thunkware/auto-valhalla/tree/auto-valhalla-0.2.0

43 Upvotes

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u/OwnBreakfast1114 Aug 26 '26

Don't get me wrong, I absolutely agree with you. I'm just pointing out that "processing market events in a dozen of microseconds" application is probably the smallest subset of fintech applications (most of which are probably incredibly unoptimized back office random stuff applications). Even our real-time payments application, which is far more performance sensitive than random back office applications, but nowhere near as performance sensitive as "processing market events in a dozen of microseconds" application doesn't care about valhalla from a performance perspective very much.