Question

我正在使用Hibernate 4.3.6。 org.hibernate.cfgConfiguration的javadoc说：

This will be replaced by use of     
org.hibernate.boot.registry.StandardServiceRegistryBuilder and    
org.hibernate.metamodel.MetadataSources instead after the 4.0 release at
which point this class will become deprecated and scheduled for removal in 5.0.

所以我尝试使用MetadataSources和StandardServiceRegistryBuilder来构建我的sessionFactory，这是我的代码：

package com.lithops.ims;

import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.metamodel.MetadataSources;

public class HibernateUtil {
    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            StandardServiceRegistryBuilder srb = new StandardServiceRegistryBuilder();
            MetadataSources md = new MetadataSources(srb.configure().build());
            return md.buildMetadata().buildSessionFactory();
        }
        catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }

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

public class HelloWorld {
    public static void main(String[] args) {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
        session.beginTransaction();
        session.save(new TradeHistory("123", new Date(), 1.2f, 100L));
        session.getTransaction().commit();
        HibernateUtil.getSessionFactory().close();
    }
}

TradeHistory.java ：

package com.lithops.ims.domain;
import java.util.Date;
public class TradeHistory {

    private Long id;
    private String code;
    private Date date;
    private float price;
    private long amount;
    public TradeHistory() {}
    public TradeHistory(String code, Date date, float price, long amount) {
        this.code = code;
        this.date = date;
        this.price =price;
        this.amount = amount;
    }
    /* setters and getters omitted */
}

TradeHistory.hbm.xml （与TradeHistory.java在同一个包中）：

<hibernate-mapping package="com.lithops.ims.domain">
<class name="TradeHistory" table="TRADE_HISTORY">
    <id name="id" column="TRADE_ID">
        <generator class="native" />
    </id>
    <property name="code" column="STACK_CODE"/>
    <property name="date"  type="timestamp" column="TRADE_TIME"/>
    <property name="price" column="PRICE" />
    <property name="amount" column="AMOUNT" />
</class>
</hibernate-mapping>

和 hibernate.cfg.xml 文件（在src/main/resources folder中）：

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>   
        <!-- properties omitted -->
        <mapping resource="com/lithops/ims/domain/TradeHistory.hbm.xml" />
    </session-factory>
</hibernate-configuration>

但似乎hibernate.cfg.xml中的映射没有被解析。执行我的应用程序时，org.hibernate.MappingException: Unknown entity...发生了。

异常堆栈信息：

Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.lithops.ims.domain.TradeHistory
    at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:1096)
    at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1443)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:116)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:209)
    at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:55)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:194)
    at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:49)
    at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:90)
    at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:715)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:707)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:702)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.hibernate.context.internal.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:356)
    at com.sun.proxy.$Proxy20.save(Unknown Source)
    at com.lithops.ims.HelloWorld.main(HelloWorld.java:31)

注意：使用Configuration类时效果很好。

Answer 1

如下所示

public void testConnection() throws Exception {

            logger.info("Trying to create a test connection with the database.");
            Configuration configuration = new Configuration();
            configuration.configure("hibernate_sp.cfg.xml");
            StandardServiceRegistryBuilder ssrb = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties());
            SessionFactory sessionFactory = configuration.buildSessionFactory(ssrb.build());
            Session session = sessionFactory.openSession();
            logger.info("Test connection with the database created successfuly.");
    }

<强> HibernateUtil.java

package your.package;

import org.hibernate.HibernateException;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

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

    static
    {
        try
        {
//          Configuration configuration = new Configuration();
            Configuration configuration = new Configuration().configure();

            serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
            sessionFactory = configuration.buildSessionFactory(serviceRegistry);
        }
        catch (HibernateException he)
        {
            System.err.println("Error creating Session: " + he);
            throw new ExceptionInInitializerError(he);
        }
    }

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

来自博客

需要修改我的hibernate 3.2.6配置和映射文件以使用xmlns="http://www.hibernate.org/xsd/hibernate-configuration"和xmlns="http://www.hibernate.org/xsd/hibernate-mapping"，并删除dtd规范。

Hibernate4：未解析hibernate.cfg.xml中的映射

1 个答案: