in pekko-connectors-sample-ftp-to-file/src/main/java/playground/filesystem/impl/JimfsFtpFile.java [320:329]
public InputStream createInputStream(long offset)
throws IOException {
// permission check
if (!isReadable()) {
throw new IOException("No read permission : " + path.getFileName());
}
return Files.newInputStream(path, StandardOpenOption.READ);
}