Github user dbtsai commented on the issue:
https://github.com/apache/spark/pull/21459
@HyukjinKwon Once Spark can be built against JDK9+, we'll need to figure
out how we want to set it up in Jenkins. We can do two builds, and one for JDK8
and another one for JDK9+ for each PR, but this can be really cost.
Alternatively, we can do a daily JDK9+ build, and fix some issues accordingly.
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