Can't compile with Scala 2.13

[wiradikusuma]

Describe the bug
Quarkus doesn't work when Scala version is changed from 2.12 to 2.13.

Expected behavior
Successfully compiled.

To Reproduce
Steps to reproduce the behavior:

1. Open https://code.quarkus.io

2. Select Scala (I also selected Gradle, resteasy-jackson, jackson, jdbc-postgresql and mailer)

3. Download and extract the skeleton project

4. Update the Scala version in build.gradle to 2.13.1

5. In ExampleResource.scala, replace def hello() = "hello" with def hello() = List("hello").minOption.get -- minOption is a new method in 2.13.

6. In the project's working directory, ./gradlew quarkusDev

7. Notice the errors. You will get something like:

    > Task :compileScala                                                                                                                      
    [Error] C:\...\src\main\scala\...\ExampleResource.scala:11: value minOption is not a member of List[String]     
    one error found
   

Environment (please complete the following information):

• Output of uname -a or ver:
  Linux Ryzen5 4.4.0-18362-Microsoft Agroal extension url configurable independent of configuration subsystem #836-Microsoft Mon May 05 16:04:00 PST 2020 x86_64 x86_64 x86_64 GNU/Linux

• Output of java -version:
  openjdk version "11.0.3" 2019-04-16
  OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.3+7)
  OpenJDK 64-Bit Server VM AdoptOpenJDK (build 11.0.3+7, mixed mode)

• GraalVM version (if different from Java):
  N/A

• Quarkus version or git rev:
  1.5.1.Final

• Build tool (ie. output of mvnw --version or gradlew --version):
  Gradle 6.3
  Build time: 2020-03-24 19:52:07 UTC
  Revision: bacd40b727b0130eeac8855ae3f9fd9a0b207c60
  Kotlin: 1.3.70
  Groovy: 2.5.10
  Ant: Apache Ant(TM) version 1.10.7 compiled on September 1 2019
  JVM: 11.0.3 (AdoptOpenJDK 11.0.3+7)
  OS: Linux 4.4.0-18362-Microsoft amd64

[gastaldi]

I tried to reproduce this issue following the steps you described but it works for me. Can you push a sample project in a Github repository?

The only difference is that I am running Fedora 32 with openjdk 11

[wiradikusuma]

I managed to narrow it down, please change a line in ExampleResource.scala -- I've updated my submission.

[gastaldi]

@wiradikusuma can you build Quarkus master from #10053 and let me know if that works for you? It worked for me locally, but a second pair of eyes would help 😉

[wiradikusuma]

@gastaldi I can confirm that it works.

[wiradikusuma]

Any news regarding Scala 2.13 support?

[wiradikusuma]

@gastaldi Any news regarding Scala 2.13 support?

[gastaldi]

@wiradikusuma I think Debezium needs to support Scala 2.13 before we migrate that.

@gunnarmorling is that possible already?

[ppalaga]

We (Camel Quarkus) would also prefer Scala 2.13 - because that's what we get from Camel.
@jpechane is Debezium ready for Scala 2.13 now?

[jpechane]

@ppalaga Debezium does not use Scala at all, it is just a question of which Kafka do we use as our dependency. I just check our main branch and we use 2.13 as dependency since 1.9.0.Alpha1.

[ppalaga]

I just check our main branch and we use 2.13 as dependency since 1.9.0.Alpha1.

Thanks for confirming, @jpechane. We are good to upgrade to scala 2.13. Then is there anybody who would like to prepare the PR?

[gsmet]

I have a branch somewhere but it would need a refresh.

[gsmet]

I created a draft PR here: #25106 . I had to rework everything as my branch was really too old and too many things had changed.
The good thing is that it was a lot simpler... except if I missed something :).