Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/10049#issuecomment-160787642
Chatted with @thunterdb and we figured out that the Scala compiler error
reported in SPARK-12000 does not occur under Java 8. Tim's Javadoc changes in
his PR are required for Javadoc compilation to work under JDK 8, but do not
address the issue where Scaladoc compilation fails under Java 7. I'm going to
see if I can fix the Java 7 doc build, since we use Java 7 for release and
snapshot builds.
In principle, we could use Java 8 to do the snapshot builds while targeting
Java 7, but then we'd have to configure out build to use a Java 7 class library
in oder to avoid the introduction of subtle incompatibilities caused by Java 8
standard library classes being used.
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