Github user srowen commented on a diff in the pull request:
    --- Diff: 
core/src/main/scala/org/apache/spark/deploy/SparkSubmitArguments.scala ---
    @@ -206,13 +206,18 @@ private[deploy] class SparkSubmitArguments(args: 
Seq[String], env: Map[String, S
           uriScheme match {
             case "file" =>
    +          var jar: JarFile = null
    --- End diff --
    This is a fine change, but use `Utils.tryWithSafeFinally` to make it cleaner

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