AsynchronousFileChannel not creating subdirectories

Question

Below program throws "java.nio.file.NoSuchFileException" when subdirecties doesnot exist in path. Could some one please help how can I acheive this ? I want to insert records in asyncronous way.

public static void main(String[] args) {

    String str = "testing application2.";
    Path path = Paths.get("/Users/santosh/test/operatord/testsd.txt");
    Set<StandardOpenOption> set = new HashSet<>();
    set.add(WRITE);
    set.add(CREATE);
    try {
        AsynchronousFileChannel asyncfileChannel = AsynchronousFileChannel.open(path, set,
                Executors.newFixedThreadPool(10));
        TestCompletionHandler handler = new TestCompletionHandler();
        ByteBuffer dataBuffer = ByteBuffer.wrap(str.getBytes());
        Attachment attachment = new Attachment(asyncfileChannel);
        asyncfileChannel.write(dataBuffer, 0, attachment, handler);
        attachment.getResponse().join();
        System.out.println(new String(Files.readAllBytes(path)));
    } catch (Throwable e) {
        e.printStackTrace();
    }

}

Answer 1

AsynchronousFileChannel not creating subdirectories

That is correct. Opening a file won't create the directories on the path to the file. You will also get this behavior with all of the standard APIs for opening a file.

You need to create the missing directories as a separate operation.

The preferred way to do this is to use Files.makeDirectories method; see javadoc. This will attempt to create all of the missing directories.

You could also use the legacy File.mkdirs(path) method; see javadoc. It does the same thing, but it has the disadvantage that it doesn't report any meaningful diagnostics if the directory (or directories) cannot be created.