manuzhang edited a comment on issue #23903: [SPARK-26977][CORE] Fix warn against subclassing scala.App URL: https://github.com/apache/spark/pull/23903#issuecomment-468104519 Yes, the warning is actually buried in the massive driver logs. Do you mean we should block all `scala.App` applications ? They will work fine if no uninitialized fields are used.
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