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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