diff --git a/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala b/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala
index 493cad0f14..b6673e4568 100644
--- a/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala
+++ b/core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala
@@ -826,18 +826,6 @@ private[spark] class SparkSubmit extends Logging {
     val app: SparkApplication = if (classOf[SparkApplication].isAssignableFrom(mainClass)) {
       mainClass.getConstructor().newInstance().asInstanceOf[SparkApplication]
     } else {
-      // Scala object subclassing scala.App has its whole class body executed in the
-      // main method it inherits. Fields of the object will not have been initialized
-      // before the main method has been executed, which will cause problems like SPARK-4170
-      // Note two Java classes are generated, the childMainClass and childMainClass$.
-      // Users will pass in childMainClass which will delegate all invocations to childMainClass$
-      // but it's childMainClass$ that subclasses scala.App and we should check for.
-      Try {
-        if (classOf[scala.App].isAssignableFrom(Utils.classForName(s"$childMainClass$$"))) {
-          logWarning("Subclasses of scala.App may not work correctly. " +
-            "Use a main() method instead.")
-        }
-      }
       new JavaMainApplication(mainClass)
     }