akka-projection-slick Scala 3 artifact/support/cross-build

[chris-arrakis]

Short description

Slick itself is now published for Scala 3, so I'm guessing it's possible to get this library there too now? I'm a little new to the Akka ecosystem, but from my attempts I couldn't find a way to use akka-projection-slick in Scala 3 due to conflicts from its dependencies.

Details

I'm not sure if there's much to change in the library. Slick was of course blocking the upgrade because it uses macros, but now that it's been ported I don't see anything this this code that raises big flags (from my admittedly pretty Scala-2-inexperienced perspective). But I'm not sure if all the dependencies are also available for Scala 3 or can be pulled in from 2.13 in a non-conflicting way to a project based on e.g. com.typesafe.akka:akka-actor-typed_3.

From a brief look I'm guess this configuration will need to be updated: https://github.com/akka/akka-projection/blob/main/build.sbt#L59 to include .settings(Scala3.settings) to add the cross build.

Not sure what other steps are needed though!

[johanandren]

If you want to give it a shot a PR is welcome!

[patriknw]

Somewhat related to akka/akka-persistence-jdbc#775

[PerWiklander]

This is now the last dependency blocking our team from adopting Scala 3 without a major rewrite of our projection code.

Slick is published for Scala 3.
akka-persistence-jdbc is published for Scala 3.

What needs to be done here and what can I help with?

[johanandren]

It has already been merged and the next akka-projection release will have all modules published for Scala 3 (I had missed out on referencing this issue in the PR)

[PerWiklander]

Is there any plan for when "the next akka-projection release" might happen?

[johanandren]

In the coming two weeks

[johanandren]

FYI @PerWiklander this has now been released in akka-projection 1.5.4