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https://issues.apache.org/jira/browse/FLINK-6866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16042807#comment-16042807
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SmedbergM commented on FLINK-6866:
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In Scala 2.11 and before, inner class `scala.collection.convert.MapWrapper` in
trait `Wrappers` does not extend `Serializable`; this was added in 2.12
> ClosureCleaner.clean fails for scala's JavaConverters wrapper classes
> ---------------------------------------------------------------------
>
> Key: FLINK-6866
> URL: https://issues.apache.org/jira/browse/FLINK-6866
> Project: Flink
> Issue Type: Bug
> Components: DataStream API, Scala API
> Affects Versions: 1.2.0, 1.3.0
> Environment: Scala 2.10.6, Scala 2.11.11
> Does not appear using Scala 2.12
> Reporter: SmedbergM
>
> MWE: https://github.com/SmedbergM/ClosureCleanerBug
> MWE console output:
> https://gist.github.com/SmedbergM/ce969e6e8540da5b59c7dd921a496dc5
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