Github user punya commented on the pull request:
https://github.com/apache/incubator-spark/pull/605#issuecomment-35454254
Unfortunately, a val in an object translates into a zero-argument static
method rather than a static final field. There was a plan to add a @static
annotation in Scala 2.10 which would have allowed people to create such fields,
but that was reverted before release.
As a result, we can either keep StorageLevels in Java for now, convert it
to Scala now and break API compatibility for existing Java users, or wait until
@static arrives in a future Scala version.
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