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https://issues.apache.org/jira/browse/SPARK-26977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16775776#comment-16775776
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Sean Owen commented on SPARK-26977:
-----------------------------------
Sure, would you like to make a pull request?
> 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
> Priority: Minor
>
> 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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