IIRC I've filed about 5 of them
. Just against the docs. Mainly against things like "you say X and yet Y happens" or "you don't say whether X is X-1 or X-2, and it's not possible to write an app defensively if the API neither mandates one NOR lets you detect it at runtime".
IIRC in one I even suggested looking at the OpenGL extension mechanisms for inspiration on providing runtime information on what behaviour and/or guarantees the actual implementation was offering
...but I've been using NIO for so long now that I really can't remember
. And there's no feature that I've found (so far; but... I haven't checked in a long time, so perhaps you can now?) that lets you search for "my filed bugs" - you have to retain the email with the URL / bug number or else lose it
. I think I filed an RFE on that a couple of years ago