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https://issues.apache.org/jira/browse/SPARK-3359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14150778#comment-14150778
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Sean Owen commented on SPARK-3359:
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Yeah I noticed this. The problem is that {{sbt-unidoc}} uses {{genjavadoc}},
and it looks like it generates invalid Java like the snippet you quote
(top-level classes can't be private). That's almost all of the extra warnings.
It seems to have been fixed in {{genjavadoc}} 0.8:
https://github.com/typesafehub/genjavadoc/blob/v0.8/plugin/src/main/scala/com/typesafe/genjavadoc/AST.scala#L107
I can see how to update the plugin in the Maven build, but not yet in the SBT
build. If someone who gets SBT can explain how to set
{{unidocGenjavadocVersion}} to "0.8" in the {{genjavadocSettings}} that is
inherited in {{project/SparkBuild.scala}}, I bet that would fix it.
https://github.com/sbt/sbt-unidoc/blob/master/src/main/scala/sbtunidoc/Plugin.scala#L22
> `sbt/sbt unidoc` doesn't work with Java 8
> -----------------------------------------
>
> Key: SPARK-3359
> URL: https://issues.apache.org/jira/browse/SPARK-3359
> Project: Spark
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 1.1.0
> Reporter: Xiangrui Meng
> Priority: Minor
>
> It seems that Java 8 is stricter on JavaDoc. I got many error messages like
> {code}
> [error]
> /Users/meng/src/spark-mengxr/core/target/java/org/apache/hadoop/mapred/SparkHadoopMapRedUtil.java:2:
> error: modifier private not allowed here
> [error] private abstract interface SparkHadoopMapRedUtil {
> [error] ^
> {code}
> This is minor because we can always use Java 6/7 to generate the doc.
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