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From Gaël Renoux (JIRA) <j...@apache.org>
Subject [jira] [Reopened] (FLINK-12461) Flink 1.8 not working with Scala 2.12.8
Date Wed, 15 May 2019 13:47:00 GMT

     [ https://issues.apache.org/jira/browse/FLINK-12461?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gaël Renoux reopened FLINK-12461:
---------------------------------

If compiling with Scala 2.12.8 is not an option, we should at least update the documentation
with a warning to not use it. It has been out for months, it is going to be the default option
for anyone installing Flink now.

> Flink 1.8 not working with Scala 2.12.8
> ---------------------------------------
>
>                 Key: FLINK-12461
>                 URL: https://issues.apache.org/jira/browse/FLINK-12461
>             Project: Flink
>          Issue Type: Bug
>    Affects Versions: 1.8.0
>            Reporter: Gaël Renoux
>            Priority: Major
>
> 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?)



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