教程中的休眠示例不起作用

Question

我正在关注一个休眠教程。我已经创建了 hibernate.cfg.xml。
本教程的第一个示例不起作用。当调用 configure 方法时，它会抛出 HibernateException 报告配置无效。我在这里留下了代码：

public static void main(String[] args) {
    Session session = null;
    try {
        Configuration configuration = new Configuration();
        configuration.configure();
        ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()
        ).buildServiceRegistry();
        SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        session = sessionFactory.openSession();
        session.beginTransaction();
        System.out.println("Adding a customer record !");
        Customer customer = new Customer();
        customer.setCustomerName("Customer-a");
        customer.setCustomerAddress("Address1");
        session.save(customer);
        session.getTransaction().commit();
        System.out.println("Done!");
    } catch (HibernateException e) {
        System.out.println("=========>" + e.getMessage());
    } finally {
        if (session != null) {
            session.flush();
            session.close();
        }
    }
}

我的 hibernate.cfg.xml 是这样的：

<hibernate-configuration
xmlns="http://www.hibernate.org/xsd/hibernate-configuration"
xsi:schemaLocation="http://www.hibernate.org/xsd/hibernate-configuration hibernate-configuration-4.0.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<session-factory>
    <!-- Database connection settings -->
    <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
    <property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
    <property name="hibernate.connection.username">pepe</property>
    <property name="hibernate.connection.password">pepe</property>
    <property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/hibernate</property>
    <property name="connection_pool_size">1</property>
    <property name="hbm2ddl.auto">updated</property>
    <property name="show_sql">true</property>
    <mapping resource="hibernateexample1/domain/costumer.hbm.xml"/>
</session-factory>

Answer 1

您可能需要在 hibernate-configuration 上方添加 hibernate DOCTYPE，即

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
      "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
      "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd" >

还要检查您的 xml 格式是否正确，查找任何未关闭的标签等，因为在配置文件中看不到“hibernate-configuration”标签的关闭。