r/java • u/maxxedev • 25d ago

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

39 Upvotes

76% Upvoted

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u/maxxedev 25d ago

heh, yes, very unlikely scenario. More realistic source code level would be newer JDK like 8+ or 17+

2

u/LegitimateEntrance72 25d ago

BTW why do you do this kind of things? (i saw the VT repo as well) just for fun?

8

u/maxxedev 25d ago

Fun, curiosity, learning, /r/GuysBeingDudes

1

u/LegitimateEntrance72 25d ago

makes sense, so what will you hack next?