Listing doesn't get deeper from the root folder

I'm trying to get a list of all files in the dropbox by using listFolder and listFolderContinue.  However I only get the list of files/folders in the root, but it doesn't go deeper.

This is my code:

DbxRequestConfig config = new DbxRequestConfig("dropbox/java-tutorial", "en_US");
DbxClientV2 client = new DbxClientV2(config, ACCESS_TOKEN);
    ListFolderResult result = client.files().listFolder("");
    while (true) {
        for (Metadata metadata : result.getEntries()) {
            System.out.println(metadata.getPathLower());
        }
        if (!result.getHasMore()) {
            break;
        }
        result = client.files().listFolderContinue(result.getCursor());
    }
} catch (DbxException e) {
    e.printStackTrace();
}

What I'm doing wrong?

Thank you for helping me!!