java.nio.file.WatchService is subtly broken on Linux

Oh hey, it's my blog post.

I reported this to Oracle about 3 months ago (ref JI-9024492) but haven't heard anything since 2015-09-29, when they contacted me asking for some code to reproduce the issue (which I gave to them on the same day). :-/

Thanks for this. I have a project using WatchService right now, and this is extremely helpful to have in mind.

Is this the problem that is mentioned within the JavaDoc https://docs.oracle.com/javase/7/docs/api/java/nio/file/Watc...

under "Platform dependencies"

It's not the same issue. In this case, it's a logic error:

1. Event A is read into a buffer.

2. Event B is read into the same buffer.

3. Event B is processed.

4. Event A is processed.

So, when (4) happens, its buffer from (1) has been clobbered.

Well that is definitely odd. I hope this does eventually get fixed.

Discussion on nio-dev mailing list: http://mail.openjdk.java.net/pipermail/nio-dev/2015-December...