Path.createFile() and createDirectory() and nonexistent parents

[Joel Uckelman]

I can't tell from the Javadoc for Path.createFile() and createDirectory()
what the expected behavior is if some element in the path (other than
the name) doesn't exist. For example, if my Path is /foo/bar, but /foo
doesn't exist, will calling Path.createFile() also create the directory
/foo or will it throw an IOException? The docs appear to leave this open;
it would be nice if they made a clear statement one way or the other,
since the current state makes it hard to know how to handle failure.

-- 
J.