Scala 2.12.19 release planning

SethTisue · June 7, 2023, 6:00pm

This thread is for updates and discussions about the upcoming Scala 2.12.19 release.

As of yet, we don’t know anything about the release’s likely timing or contents.

We can use this thread to ask, propose, discuss.

SethTisue · July 26, 2023, 3:10pm

There doesn’t seem to be a reason to do a 2.12.19 yet, so unless something new comes up, it looks like we’ll go ahead with 2.13.12 in August and 2.12.19 will wait until some unknown future date.

SethTisue · December 5, 2023, 7:22pm

We’ll do 2.12.19 in tandem with 2.13.13, aiming for sometime in January.

Very little has been merged on the 2.12.x branch, but a lot of time has passed (2.12.18 was in May), and we’d like to ship the ASM 9.6 upgrade (for JDK 22 support) and a couple of backported bugfixes.

SethTisue · January 22, 2024, 4:18am

There are no more open 2.12.x PRs.

2.12.19 release candidate is: 2.12.19-bin-4e0f4fa

(How do I use a nightly build of Scala? - Stack Overflow)

PRs with “release-notes” label: Pull requests · scala/scala · GitHub

Please test! We’ll release it as soon as 2.13.13 is also ready.

SethTisue · January 25, 2024, 4:30pm

We have merged one additional PR:

which backports the new -Yrelease flag from 2.13.13, so that it will be usable in crossbuilt projects. (There is a discussion on the PR about the decision to do the late-breaking merge.)

The new release candidate is: 2.12.19-bin-6c0a9bc

SethTisue · January 25, 2024, 5:50pm

Only minutes after I wrote the above, I noticed a bug report involving JDK 21 bytecode that we should fix for 2.12.19. So there will be another release candidate.

The bug in question is "bad constant pool tag" when using a library compiled using Java 21 · Issue #12936 · scala/bug · GitHub (originally reported by Adam Warski against Scala 3, but 2 is affected as well)

SethTisue · January 26, 2024, 1:22pm

New release candidate (with the JDK 21 fix) is 2.12.19-bin-afbad90

hepin1989 · January 27, 2024, 1:13am

Maybe java 11 bytecode

SethTisue · February 6, 2024, 7:02pm

Scala 2.12.19 draft release notes:

github.com

SethTisue/scala-dev/blob/scala-2.12.19/releases/2.12.19.md

# Scala 2.12.19

This release improves **compatibility**:

* Support certain Java libraries compiled on JDK 21 ([#10675](https://github.com/scala/scala/pull/10675) by [@SethTisue](https://github.com/SethTisue))
* Support JDK 22 in optimizer (by upgrading to ASM 9.6) ([#10575](https://github.com/scala/scala/pull/10575) by [@Philippus](https://github.com/Philippus))
* New `-Yrelease` option supplements `--release`, allows access to additional JVM packages ([#10671](https://github.com/scala/scala/pull/10671) by [@som-snytt](https://github.com/som-snytt))
* Update compiler's scala-xml dependency to 2.2.0 (was 2.1.0) ([#10459](https://github.com/scala/scala/pull/10459) by [@SethTisue](https://github.com/SethTisue))

And it has **bugfixes**:

* Fix rare `NullPointerException` in some tree-based collections ([#10640](https://github.com/scala/scala/pull/10640) by [@lrytz](https://github.com/lrytz))
* Improved `InterruptedException` handling for `Future`s ([#10379](https://github.com/scala/scala/pull/10379) by [@szeiger](https://github.com/szeiger))

For complete 2.12.19 change lists, see [all merged PRs](https://github.com/scala/scala/pulls?q=is%3Amerged%20milestone%3A2.12.19) and [all closed bugs](https://github.com/scala/bug/issues?utf8=%E2%9C%93&q=is%3Aclosed+milestone%3A2.12.19).

## Compatibility

As usual for our minor releases, Scala 2.12.19 is [binary-compatible](https://docs.scala-lang.org/overviews/core/binary-compatibility-of-scala-releases.html) with the whole Scala 2.12 series.

This file has been truncated. show original

If you have any suggested improvements to the notes themselves, you can comment on this pull request.

SethTisue · February 13, 2024, 4:20pm

Heads up – limited time remains for testing!

We will publish 2.12.19 to Maven Central no sooner than Tue Feb 20, and fully announce it no sooner than Thu Feb 22.

sjrd · February 15, 2024, 3:39pm

Scala.js 1.15.0 passes. Sorry for the late testing.

SethTisue · February 21, 2024, 5:05am

2.12.19 JARs are now on Maven Central.

Tooling and compiler plugin maintainer powers, activate! Please publish support.

We won’t announce before Friday, February 23, 2024.

SethTisue · February 21, 2024, 5:44am

For those whose projects depend on macro paradise:

I’m having some trouble trying to publish the paradise plugin for 2.12.19. I’ll update this thread once Lukas and I get that figured out.

WojciechMazur · February 21, 2024, 8:23am

Scala Native (0.4.15-0.4.17) compiler plugins are on their way to Maven Central

sjrd · February 21, 2024, 9:09am

Scala.js 1.15.0 for Scala 2.12.19 is available on Maven Central.

Older versions are in progress.

SethTisue · February 21, 2024, 4:33pm

Macro paradise is now available: Central Repository: org/scalamacros/paradise_2.12.19/2.1.1

(thanks Lukas!)

SethTisue · February 23, 2024, 3:49pm

Most tooling is now place, but not quite all, so no announcement today — perhaps Monday.

SethTisue · February 25, 2024, 8:22pm

Metals support is now in place and other key tooling has published, so it looks like we’re all set to announce first thing Monday (US West Coast time). Please raise any doubts soon if you have them.

SethTisue · February 26, 2024, 10:13pm

2.12.19 is now fully announced! Thanks to everyone who participated, even in the smallest way.