Github user vanzin commented on the issue:
https://github.com/apache/spark/pull/16871
> It might work to output 1.7 bytecode from SBT just for 2.10.
This is the discussion we were having earlier
(https://github.com/apache/spark/pull/16871#discussion_r100643005). If you
copy&paste the code that was under the java8 test settings into the place where
you set the scala target to 1.8, it should fix this.
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