public static void main(String[] args) throws JAXBException, IOException {
Books books = new Books();
// create books
Book book1 = new Book();
book1.setIsbn("978-1617290060");
book1.setTitle("The Well-Grounded Java Developer: Vital techniques of Java 7 and polyglot programming");
book1.setAuthor("Benjamin J Evans");
// create genre objects
Genre java = new Genre();
java.setType("Java");
Genre scala = new Genre();
scala.setType("Scala");
book1.setGenres(new Genres()); //Books do not need to *have* a list of Genres so create a list here
// link genres with genre list
book1.getGenres().getGenre().add(java);
book1.getGenres().getGenre().add(scala);
// add book to list of books
books.getBook().add(book1);
// create book2 note there are no genres in this book
Book book2 = new Book();
book2.setIsbn("978-3832180577");
book2.setTitle("Java Concurrency in Practice");
book2.setAuthor("Brian Goetz");
// add book to list of books
books.getBook().add(book2);
// create JAXB context and instantiate marshaller