单独使用Hibernate时，出现Unknown entity异常的问题

Question

先把该帖的贴出来

News.java

package dong.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="news_inf")
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;
    }
}

hibernate.cfg.xml

 <?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>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">dongzhong1990</property>
        <property name="hibernate.c3p0.max_size">20</property>
        <property name="hibernate.c3p0.min_size">1</property>
        <property name="hibernate.c3p0.timeout">5000</property>
        <property name="hibernate.c3p0.max_statements">100</property>
        <property name="hibernate.c3p0.idle_test_period">3000</property>
        <property name="hibernate.c3p0.acquire_increment">2</property>
        <property name="hibernate.c3p0.validate">true</property>
        <property name="dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
        <property name="hbm2ddl.auto">update</property>
        <property name="show_sql">true</property>
        <property name="hibernate.format_sql">true</property>

        <!-- 此处罗列所有持久化类的类名 -->
        <mapping class="dong.domain.News" />
    </session-factory>
</hibernate-configuration>

NewsManager.java

 package dong;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;

import dong.domain.News;

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 news = new News();
        news.setTitle("aaa");
        news.setContent("欧耶欧耶欧耶");
        sess.save(news);
        System.out.println("aaa");

        tx.commit();
        sess.close();
        sf.close();
    }
}

运行后就会出现Unknown entity的异常，在网上搜的方法都没有用不知道该怎么弄，求各位大神帮帮我呀

Answer 1

对 News 实体的注解应该有问题，你要存储实体中得每个属性，那就得给每个属性做数据库表的字段映射

@Column(name = "F_DATA_LEVEL")//注解对应数据库中的字段名

public String getTitle()；