Cross-compile modules for Scala 3

[DieBauer]

• akka-http-argonaut (see Add scala 3 support for Argonaut, Jsoniter, Json4s and Zio-json #754 )
• akka-http-avro4s avro4s-json module does not have a Scala 3 flavour and is removed from project
• akka-http-circe (see Add scala 3 support for uPickle, Jackson and Circe #757 )
• akka-http-jackson (see Add scala 3 support for uPickle, Jackson and Circe #757 )
• akka-http-json4s (see Add scala 3 support for Argonaut, Jsoniter, Json4s and Zio-json #754 )
• akka-http-jsoniter-scala (see Add scala 3 support for Argonaut, Jsoniter, Json4s and Zio-json #754 )
• akka-http-ninny - Scala 3 available, but not Auto derivation (Scala 3 support (without auto derivation) nrktkt/ninny-json#32), so import io.github.kag0.ninny.Auto._ doesn't exist, and ToSomeJson and FromJson need to be constructed manually in order for tests to pass.
• akka-http-play-json - In progress Scala 3 playframework/playframework#11260
• akka-http-upickle (see Add scala 3 support for uPickle, Jackson and Circe #757 )
• akka-http-zio-json (see Add scala 3 support for Argonaut, Jsoniter, Json4s and Zio-json #754 )

And of course akka (or Pekko) itself, currently the akka-http modules are not cross-published for Scala 3

[luksow]

@DieBauer since akka-http has a 10.5.0-M1 release for Scala 3 (e.g. https://repo1.maven.org/maven2/com/typesafe/akka/akka-http-core_3/10.5.0-M1/) what are the next steps planned here?

[pjfanning]

If you want to support Jackson for Scala 3, you can look at a change I made to my Pekko fork of this lib. I removed the scala-reflect dependency that akka-http-jackson has and started using jackson-module-scala's ClassTagExtensions to support getting class information from implicit ClassTags.

• 4e909d9
• 973c3e2 (small mods to get code to compile in Scala 3)

[DieBauer]

@pjfanning I think we did the same changes, see #757 for the jackson scala 3 support :)

@luksow, I can update akka version as well. But I'm not sure when a release will be cut with the other modules in as well, @hseeberger what is your idea of this project?

[hseeberger]

I'd love to find other maintainers, because currently I have no time to work on it.

[pjfanning]

If we can get a few volunteers together to maintain these libs and their pekko equivalents, I guess I can help out.