Github user srowen commented on the issue:
https://github.com/apache/spark/pull/18807
The Maven build is the build of reference, and we rely on IDEs to parse the
details of the build from the pom.xml file. So it's right for the IDE to need
to find information like JDK level (among a hundred other things) in the POM
file. The `maven-compiler-plugin` is a standard built-in plugin whose config it
consults to figure this out. It's not at all a hack. At least: we've always had
this (and other superfluous config) for the compiler plugin in the build. This
just cropped up because we trimmed it, and trimmed two lines too far.
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