Is this a bug in Files.lines(), or am I misunderstanding something about parallel streams?

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Since the current state of the issue is quite the opposite of the earlier statements made here, it should be noted, that there is now an explicit statement by Brian Goetz about the back-propagation of the unordered characteristic past a skip operation is considered a bug. It’s also stated that it is now considered to have no back-propagation of the ordered-ness of a terminal operation at all.

There is also a related bug report, JDK-8129120 whose status is “fixed in Java 9” and it’s backported to Java 8, update 60

I did some tests with jdk1.8.0_60 and it seems that the implementation now indeed exhibits the more intuitive behavior.

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