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https://issues.apache.org/jira/browse/SPARK-26027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16684567#comment-16684567
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Jason Moore commented on SPARK-26027:
-------------------------------------
Actually, the fact that scala-library 2.11.12 is downloaded to launch the zinc
server turned out to be a red herring and my issue was not properly setting the
profile to scala-2.12. I'm not sure of the repercussion of having the zinc
server started by ./build/mvn having 2.11.12 though (see
[https://github.com/apache/spark/blob/master/build/mvn#L155|https://github.com/apache/spark/blob/master/build/mvn#L155).])
so maybe someone with a more intimate knowledge of it can comment.
> Unable to build Spark for Scala 2.12 with Maven script provided
> ---------------------------------------------------------------
>
> Key: SPARK-26027
> URL: https://issues.apache.org/jira/browse/SPARK-26027
> Project: Spark
> Issue Type: Bug
> Components: Build
> Affects Versions: 2.4.0
> Reporter: Jason Moore
> Priority: Minor
>
> In ./build/mvn, <scala.version> from pom.xml is used to determine which Scala
> library to fetch but it doesn't seem to use the value under the scala-2.12
> profile even if that is set.
> The result is that the maven build still uses scala-library 2.11.12 and
> compilation fails.
> Am I missing a step? (I do run ./dev/change-scala-version.sh 2.12 but I think
> that only updates scala.binary.version)
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