Behavior of concat(null)

elena votchennikova elena.votchennikova at
Mon Nov 19 07:17:41 PST 2012


I'm trying to use method concat(Stream) of some Stream implementation 
with null-argument and currently it doesn't throw NullPointerException. 
Exception is thrown only when I call some method of the resulting 
Stream, for example iterator().

Could you please explain - is it an expected behavior or concat() with 
null-argument should throw NPE?

Thanks a lot,

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