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https://issues.apache.org/jira/browse/FLINK-12461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842062#comment-16842062
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Aljoscha Krettek commented on FLINK-12461:
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I tried building Flink 1.8 with Scala 2.12.8. It fails with binary
compatibility checks because the compiler changes how some methods are
generated:
{code:java}
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal
com.github.siom79.japicmp:japicmp-maven-plugin:0.11.0:cmp (default) on project
flink-scala_2.12: Breaking the build because there is at least one
incompatibility:
org.apache.flink.api.scala.CoGroupDataSet.$anonfun$buildGroupSortList$1(org.apache.flink.api.common.typeinfo.TypeInformation,java.util.ArrayList,scala.Tuple2):METHOD_REMOVED,org.apache.flink.api.scala.typeutils.CaseClassTypeInfo.$anonfun$getFlatFields$1(int,java.util.List,scala.runtime.IntRef,org.apache.flink.api.common.typeinfo.TypeInformation):METHOD_REMOVED,org.apache.flink.api.scala.typeutils.CaseClassTypeInfo.$anonfun$getFlatFields$1$adapted(int,java.util.List,scala.runtime.IntRef,org.apache.flink.api.common.typeinfo.TypeInformation):METHOD_REMOVED
-> [Help 1]{code}
> 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
> Components: API / Scala
> Affects Versions: 1.8.0
> Reporter: Gaël Renoux
> Assignee: Aljoscha Krettek
> 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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