Author steinbeck = new Author();
steinbeck.setFirstName("John");
steinbeck.setLastName("Steinbeck");
Book buddenbrooks = new Book();
buddenbrooks.setTitle("Buddenbrooks");
buddenbrooks.setAuthor(mann);
mann.getBooks().add(buddenbrooks);
Book eden = new Book();
eden.setTitle("East of Eden");
eden.setAuthor(steinbeck);
steinbeck.getBooks().add(eden);
save(mann);
save(steinbeck);
save(buddenbrooks);