Java 在Dropwizard和mysql中持久化应用程序启动时间

我正在试图节省在数据库中重新启动dropwizard服务器的时间。为此，我创建了以下内容

应用程序对象

JsonIgnoreProperties(ignoreUnknown = true)
@Entity
@Table(name = "app")

@NamedQuery(name = "App.findAll", query = "SELECT d FROM App d")

public class App implements  Serializable{

    private static final long serialVersionUID = 1L;
    AppDAO adao;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    long id;

    @JsonProperty
    Date started;

    public App ( Date started) {
        this.started = started;
    }

AppDAO类

public class AppDAO extends  AbstractDAO<Appr>  {
    public SessionFactory sessionFactory;

    public AppDAO(SessionFactory sessionFactory) {
        super(sessionFactory);
    }

    public Session session;

    public App create(App app) {
        return persist(app);
    }

---

我遗漏了什么？

我也有同样的问题。如果找到解决方案，请更新！最后，我在数据访问对象的创建方法中使用了原始jdbc。没有原始jdbc，它还能工作吗？我没有。在这一过程中，我确实了解到添加@UnitOfWork不会缓解当前绑定会话的异常，但这是针对资源方法的，在这种情况下没有帮助。

public class Main Application extends Application<MainConfiguration> {

    private final HibernateBundle<DeployerConfiguration> hibernate = new HibernateBundle<AppConfiguration>(App.class) {
        public DataSourceFactory getDataSourceFactory(
                AppConfiguration configuration) {
            return configuration.getDataSourceFactory();
        }
    };

    @Override
    public void initialize(Bootstrap<AppConfiguration> bootstrap) {
        bootstrap.addBundle(hibernate);
    }

    public static void main() {
        final AppDAO ddao = new AppDAO(hibernate.getSessionFactory());
        App app = new App(new Date());
        adao.create(app);
    }

    Exception in thread "main" org.hibernate.HibernateException: No session currently bound to execution context