jdk.internal.jrtfs.JrtFileSystem#getFileAttributes never return 'null'. But in JrtPath.getAttributes its result is checked for null:

    final JrtFileAttributes getAttributes(LinkOption... options) throws IOException {
        JrtFileAttributes zfas = jrtfs.getFileAttributes(this, options);
        if (zfas == null) {
            throw new NoSuchFileException(toString());
        }
        return zfas;
    }

We can simplify and speed up code a bit.