Question

我使用这个Java代码在JSF应用程序和SQLite数据库中使用Hibernate进行SQL查询：

Hibernate配置文件：

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.format_sql">true</property>
        <property name="hibernate.connection.datasource">java:comp/env/jdbc/sqliteDB</property>
        <property name="hibernate.dialect">org.hibernate.dialect.SQLiteDialect</property>
        <property name="hibernate.connection.driver_class">org.sqlite.JDBC</property>
        <property name="hibernate.connection.release_mode">auto</property>
        <property name="current_session_context_class">thread</property>
        <property name="hibernate.connection.autoReconnect">true</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        <mapping class="com.web.models.SystemUsers"/>
    </session-factory>
</hibernate-configuration>

工厂：

 public class HibernateUtil
    {
        private static final SessionFactory sessionFactory;
        private static ServiceRegistry serviceRegistry;

        static
        {
            try
            {
                StandardServiceRegistry standardRegistry
                    = new StandardServiceRegistryBuilder().configure("hibernate.cfg.xml").build();
                Metadata metaData
                    = new MetadataSources(standardRegistry).getMetadataBuilder().build();
                sessionFactory = metaData.getSessionFactoryBuilder().build();
            }
            catch (Throwable th)
            {
                System.err.println("Enitial SessionFactory creation failed" + th);
                throw new ExceptionInInitializerError(th);
            }
        }

        public static SessionFactory getSessionFactory()
        {
            return sessionFactory;
        }
    }

我使用此代码调用Hibernate工厂类：

private List<SystemUserObj> generateSystemUsers()
    {
        try (SessionFactory sessFact = HibernateUtil.getSessionFactory())
        {
            Session session = sessFact.getCurrentSession();
            Transaction tr = session.beginTransaction();

            List<SystemUsers> dataList = session.createQuery("from SystemUsers").list();

            for (SystemUsers user : dataList)
            {
                ........
            }

            session.flush();
            tr.commit();
        }

        return list;
    }

然后我第一次正确加载数据时打开网页，但是当我第二次打开页面时出错：

Caused by: java.lang.IllegalStateException: EntityManagerFactory is closed

你知道如何解决这个问题吗？可能我的工厂类没有正确实施？

另外我如何重构Factory代码以便我可以同时发出多个请求？

重新加载页面时，EntityManagerFactory将关闭

0 个答案: