Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/12181#issuecomment-205985264
```
[warn] Java 8 tests will not run because JDK version is < 1.8.
```
I think that the default PR builder might still be running Java 7 because
my first attempt at switching to Java 8 seemed to have introduced some
transient flakiness. I'm going to go ahead and re-push the config changes to
enable the Java 8 tests and will fix any flakiness that crops up. I'll email
`dev@` now to let folks know.
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