Github user HyukjinKwon commented on the issue:
https://github.com/apache/zeppelin/pull/3034
> Spark 2.4 will officially support Scala 2.12, so it will be great if
Zeppelin will support it together with Spark. And also, there are some libs
that are Scala 2.12 only
The default distribution will still be with Scala 2.11 for Spark 2.4 if I
am not mistaken. It is nice to support it but Spark 2.4 with 2.11 should be
supported first as a higher priority. I can work on 2.4.0 with 2.12 support
further after this one got merged.
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