连接不能为null hibernate异常

我是个冬眠新手。当我尝试运行它时，我遇到了这样一个异常“未设置hibernate.dia方言时连接不能为null”。我已正确地设置了方言

这是hibernate.cfg.xml文件

<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/mysql</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">admin</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.hbm2ddl.auto">create</property>

<mapping class="org.siva.model.UserDetails"/>
</session-factory>
</hibernate-configuration>

主课

public class HibernateTest {

public static void main(String[] args) {
   UserDetails user=new UserDetails();
   user.setUserID(1);
   user.setUserName("firstUser");
   Configuration configuration=new Configuration();
   ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();        
   SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
   Session session=sessionFactory.openSession();
   session.beginTransaction();
   session.save(user);
   session.getTransaction().commit();

}

---

}您忘记配置配置了。例如，使用此调用

Configuration configuration=new Configuration().configure();

Configuration configuration=new Configuration().configure();