问题描述

初学Hibernate遇到问题，求解答~

运行一个hibernate例子，但是报错，小白不知道该怎么解决，麻烦大神帮看看。
我把代码贴出来~
（1）.
package hibernate;
import org.hibernate.*;
import org.hibernate.cfg.*;
import org.hibernate.service.*;
import org.hibernate.boot.registry.*;
public class NewsManager
{
public static void main(String[] args)
throws Exception
{
Configuration conf = new Configuration()
.configure();
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
.applySettings(conf.getProperties()).build();
SessionFactory sf = conf.buildSessionFactory(serviceRegistry);
Session sess = sf.openSession();
Transaction tx = sess.beginTransaction();
News n = new News();
n.setTitle(""Java"");
n.setContent(""Java"");
sess.save(n);
tx.commit();
sess.close();
sf.close();
}
}

---

（2）.
package hibernate;
import javax.persistence.*;
@Entity
@Table(name=""news_info"")
public class News
{
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Integer id;
private String title;
private String content;
public void setId(Integer id)
{
this.id = id;
}
public Integer getId()
{
return this.id;
}
public void setTitle(String title)
{
this.title = title;
}
public String getTitle()
{
return this.title;
}
public void setContent(String content)
{
this.content = content;
}
public String getContent()
{
return this.content;
}
}

---

（3）. hibernate.cfg.xml文件
<?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"">

org.gjt.mm.mysql.Driver
root
jdbc:mysql://localhost:3306/hibernate
root
org.hibernate.dialect.MySQL5InnoDBDialect

（标签贴不出来）

---

（4）错误信息
Exception in thread ""main"" org.hibernate.MappingException: Unknown entity: hibernate.News
at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:781)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1520)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:100)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:679)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:671)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:666)
at hibernate.NewsManager.main(NewsManager.java:24)

解决方案

没看到你的扫描配置...