srowen commented on issue #25423: 
[SPARK-28701][test-hadoop3.2][test-java11][k8s] adding java11 support for pull 
request builds
URL: https://github.com/apache/spark/pull/25423#issuecomment-522354637
 
 
   I don't believe `-release` is an option for cross-compiling, because the 
scala plugin doesn't seem to support it. I think it's safer to use JDK 8; 
what's the issue with that other than having two JDKs installed, but, we 
already do. Definitely if you figure it out, we can try it out.
   
   Without the `java.version` change, even using JDK 11 you're not really 
testing vs 11's classes.

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