This is an additional information.
Methods that access file attributes(stat) raise the same error.
For example File.ctime and File.ftype.

• File.ctime

# coding: utf-8

path = './てすと.txt'
puts "FileTest.readable?: #{FileTest.readable?(path)}"
puts File.ctime(path)

> jruby -J-Dfile.encoding=utf-8 .\stat.rb
FileTest.readable?: true
Errno::ENOENT: No such file or directory - ./縺ｦ縺吶→.txt
   ctime at org/jruby/RubyFile.java:860
  (root) at .\stat.rb:5

• File.ftype

> jruby -J-Dfile.encoding=utf-8 .\stat.rb
FileTest.readable?: true
Errno::ENOENT: No such file or directory - ./縺ｦ縺吶→.txt
   ftype at org/jruby/RubyFile.java:827
  (root) at .\stat.rb:5

I think handling of the path encoding when accessing the file attributes may be a cause.

Confirmed in JRuby 9k as well. This should be really be fixed for 9k.pre2.

Ok, I think I see the problem. We are using _stat64 as our win32 stat call, but we probably should be using _wstat which supports wide characters. There may be a way to make stat64 work properly if we transcode the characters to some appropriate encoding (we we may not be doing by just letting default Java transcoding convert the char[] back to byte[].

I'll see if I can get a jnr-posix change made to add _wstat.

Yup, that appears to fix it. We will need to patch and release jnr-posix for this. I will make the change there, but we need a release of it and pom.xml bump for 9k.pre2.

This may also fix it in 1.7, but I did not test that. 1.7 would need the same jnr-posix upgrade treatment.

Tagging @enebo re: jnr-posix lifecycle.

Reopening since it still needs release, and @enebo may want us to explore fixing it in 1.7.20 as well.

Yeah definitely. We just need to understand more about our last deployment attempt of jffi or possibly just back off that to get these fixes in under the guise of least risk perhaps.

I've got the commit to update 1.7 in my local repo and will push shortly, so let's call this fixed.

Oh all right, let's actually just leave it open until @enebo or I can confirm it on Windows.

Works on windows with jruby-1_7. Closing.