[jira] [Commented] (FLINK-12461) Document binary compatibility situation with Scala beyond 2.12.8

["Chesnay Schepler (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-12461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17273637#comment-17273637 ] 

Chesnay Schepler commented on FLINK-12461:
------------------------------------------

Do we maybe want to do a survey on the user ML whether users would prefer breaking the API over being stuck with scala 2.12.8?

> Document binary compatibility situation with Scala beyond 2.12.8
> ----------------------------------------------------------------
>
>                 Key: FLINK-12461
>                 URL: https://issues.apache.org/jira/browse/FLINK-12461
>             Project: Flink
>          Issue Type: Bug
>          Components: API / Scala
>    Affects Versions: 1.8.0
>            Reporter: Gaël Renoux
>            Assignee: Aljoscha Krettek
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.13.0, 1.12.2
>
>
> When using 1.8 with Scala 2.12.8 and trying to parse a scala.Map (not a java.util.Map), I get a: java.lang.ClassNotFoundException: scala.math.Ordering$$anon$9
> To reproduce:
>  - start with the Scala Maven archetype (org.apache.flink:flink-quickstart-scala:1.8.0)
>  - in the POM, set the scala.version to 2.12.8 and the scala.binary.version to 2.12
>  - in StreamingJob, add: env.fromElements[Map[String, Int]]()
> It works with Scala 2.12.7 (well, without putting anything in the job, it fails with "No operators defined in streaming topology", which is expected).
> I suspect this is linked to the binary incompatiblity of 2.12.8 with 2.12.7 (see the release note of 2.12.8), so compiling Flink with 2.12.8 instead of 2.12.7 might be enough (although it might stop working with 2.12.7?)



--
This message was sent by Atlassian Jira
(v8.3.4#803005)