The State of Project Valhalla with Brian Goetz

Conversation with Project Valhalla lead Brian Goetz about Java's original sin, unifying the type system, expanding generics, current work, the project timeline and more.

0:00 Intro
1:33 Primitives and references today
8:07 Valhalla's goals
10:14 WHAT'S WITH THE HELMET?!
10:59 JEPs 401, 402, and the 3rd one
19:25 Reference-preferring primitive types
23:07 The 3rd JEP again
27:17 Progress and timeline, Panama and Loom
31:50 Primitive types and heap vs stack
40:30 Outro

JEPs:

[pavelhoral]

Valhalla and Loom... Java future never looked more promising. Thank you for the interview.

[DanHowardMtl]

You'd better upload that next part - don't leave us in a lurch!

[gaijinco]

I'm very interested in Pattern Matching and project Amber, hope you can upload that video soon! Thanks Nicolai, one of the great benefits of working in Java is that there's a string community behind it, and you certainly do a lot to keep us informed and updated!

[tintifax]

This video series is getting better and better. Except for the primal scream at the beginning...some of us have to work in an office!

[sitrilko]

Ofcourse upload part 2! How is that even a question?!
Just assume our curiosity is terminal!

[quintesse]

Of course we're interested in hearing the rest!!! :-)

[redcrafterlppa]

I literally just wrote a class similar to the Substring class mentioned in the jeb. It works without value/primitive types too but I will most definitely "upgrade" it to a value /primitive type. The performance will be even greater.

[jcsahnwaldt]

Great interview! Thanks. The third JEP is titled "JEP draft: Universal Generics (Preview)". But the shtupid shpam filter makes it exceedingly difficult to post any useful information here. For example, the number or URL of the third JEP...

[Tristan]

Great talk as usual, thanks! Also what an exceptional thumbnail 😄

[BrettRyan]

Oh, please do the pattern match for map discussion. I would love that

[redcrafterlppa]

Will you be able to do something like:
static <T, U> Optional<U> foo(T obj) {
if (obj instanceof U u)
return Optional.of(u) ;
return Optional.empty();
}
When the generic overhaul is done?

[HarmeetSingh]

Without any doubt, please upload other videos :)

Which places other than Map#get will reference projection be needed?

[kasparsr]

Cool video. Really nice to see good content on Java. Just one small thing - the spun of your mechanical keyboard.

[jamesratzlaff]

It would be nice if the ability to define operators (addition, division...etc) could be a feature. Not sure if anyone submitted a JEP for it. It has a definite use case in regard to structures that only contain primitives, such as vectors (not the ancient Vector data type but linear algebra vectors).

Side note: I kind of understand why people want a CharStream class (mentioned a 6:34), but in my opinion, the char primitive feels broken. Or maybe it's unicode v2 that's broken --using 21-bits of space feels gross (which my guess is why a String has the IntStream method). I wish something could be done about that.

[CoderGrammer]

Very nice. By the way, what interview recording software do you use?

[cyamdirl]

I am waiting for support Jdk 17 by Kotlin compiler

[JoJoModding]

Using chars should be discouraged. Instead, consider the IntStream of code points.

[cyamdirl]

it is not easy to deliver a complete valhalla project in a short time

[bryancjacobs]

Please not typing....I'm trying to listen