manuzhang commented on issue #23903: [SPARK-26977][CORE] Fix warn against subclassing scala.App URL: https://github.com/apache/spark/pull/23903#issuecomment-468130145 When user tries to run `MyApp`, the passed in main class is `MyApp` instead of `MyApp$`. The fix is to check whether `MyApp$` extends `scala.App`. ``` childMainClass == "MyApp" s"$childMainClass$$" == "MyApp$" ```
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