manuzhang commented on issue #23903: [SPARK-26977][CORE] Fix warn against subclassing scala.App URL: https://github.com/apache/spark/pull/23903#issuecomment-468100299 > I find that the current check works if you check whether "MyApp$" extends `scala.App` Could you please provide a `spark-submit` example ? Both `spark-submit --class MyApp` (for `class MyApp extends scala.App`) and `spark-submit --class MyApp$` (for `object MyApp extends scala.App`) will fail with ``` Exception in thread "main" java.lang.IllegalStateException: The main method in the given main class must be static at org.apache.spark.deploy.JavaMainApplication.start(SparkApplication.scala:44) at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:894) at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:198) at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:228) at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:137) at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala) ```
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