// ALUNO: Não apague essa classe
public static void main(String[] args) {
EntityManagerFactoryCreator creator = new EntityManagerFactoryCreator();
creator.create();
EntityManagerCreator managerCreator = new EntityManagerCreator(creator.getInstance());
managerCreator.create();
EntityManager manager = managerCreator.getInstance();
manager.getTransaction().begin();
manager.createQuery("delete from Sessao").executeUpdate();
manager.createQuery("delete from Espetaculo").executeUpdate();