Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/19675#discussion_r149103482
--- Diff: core/src/main/scala/org/apache/spark/util/ClosureCleaner.scala ---
@@ -38,12 +38,13 @@ private[spark] object ClosureCleaner extends Logging {
// Copy data over, before delegating to ClassReader - else we can run
out of open file handles.
val className = cls.getName.replaceFirst("^.*\\.", "") + ".class"
val resourceStream = cls.getResourceAsStream(className)
- // todo: Fixme - continuing with earlier behavior ...
- if (resourceStream == null) return new ClassReader(resourceStream)
--- End diff --
Note that this already immediately generated an exception from `ClassReader`
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