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

["Sean Owen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-26977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sean Owen reassigned SPARK-26977:
---------------------------------

    Assignee: Manu Zhang

> 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
>            Assignee: 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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