Github user mxm commented on the issue:
https://github.com/apache/flink/pull/2692
Thanks for checking out the changes.
Yes, it is handled correctly. Indeed, I started off just thinking about the
user-provided jar but then discovered that the `PackagedProgram` extracts
nested jars within that jar. The code handles that transparently in the sense
that the shipped user jars are always represented by a list of URLs. Either a
singleton list or multiple entries in case of nested jars.
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