Github user markhamstra commented on the issue: https://github.com/apache/spark/pull/18807 Maven is the build of reference, true; but maven itself doesn't need the JDK version to be specified both in the scala plugin configuration and in the compiler plugin configuration. While I understand that IntelliJ is used by many Spark developers, it isn't some sort of officially preferred IDE of reference. That's why I have some qualms about embedding workarounds into our POM just to satisfy the idiosyncrasies of a particular IDE.
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