@Test
    public void test() throws JAXBException {
        Row comment = new Row();
        comment.postId = "1";
        comment.userId = "2";
        comment.text = "text";
        comment.creationDate = "some date";
        JAXBContext context =
                JAXBContext.newInstance(Row.class);
        Marshaller m = context.createMarshaller();
        m.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
        m.marshal(comment, System.err);
    }