[jira] [Created] (SPARK-26977) Warn against subclassing scala.App doesn't work

["Manu Zhang (JIRA)" <ji...@apache.org>]

Manu Zhang created SPARK-26977:
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             Summary: Warn against subclassing scala.App doesn't work
                 Key: SPARK-26977
                 URL: https://issues.apache.org/jira/browse/SPARK-26977
             Project: Spark
          Issue Type: Bug
          Components: Spark Submit
    Affects Versions: 2.4.0
            Reporter: Manu Zhang


As per discussion in [PR#3497|https://github.com/apache/spark/pull/3497#discussion_r258412735], the warn against subclassing scala.App doesn't work. For example,


{code:scala}
object Test extends scala.App {
   // spark code
}
{code}

Scala will compile {{object Test}} into two Java classes, {{Test}} passed in by user and {{Test$}} subclassing {{scala.App}}. Currect code checks against {{Test}}  and thus there will be no warn when user's application subclassing {{scala.App}}



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