慕课网Hibernate错误记录

package entity;

import java.util.Date;

public class Students {
    private int sid;
    private String name;
    private String gender;
    private Date birthday;
    private String address;

    public Students(){

    }

    public Students(int sid, String name, String gender, Date birthday, String address) {
        this.sid = sid;
        this.name = name;
        this.gender = gender;
        this.birthday = birthday;
        this.address = address;
    }

    public int getSid() {
        return sid;
    }

    public void setSid(int sid) {
        this.sid = sid;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Students{" +
                "sid=" + sid +
                ", name='" + name + '\'' +
                ", gender='" + gender + '\'' +
                ", birthday=" + birthday +
                ", address='" + address + '\'' +
                '}';
    }
}

以上是entity类

import entity.Students;
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 org.junit.After;
import org.junit.Before;
import org.junit.Test;

import java.util.Date;


public class StudentsTest {
    private SessionFactory sessionFactory;
    private Session session;
    private Transaction transaction;

    @Test
    public void saveStudent(Students students){
        //
        Students s=new Students(1,"张三丰","男",new Date(),"武当");
        session.save(s);
    }

    @Before
    public void init(){
        //创建配置对象
        Configuration config=new Configuration().configure();
        //创建服务注册对象
        ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
        //创建会话工厂
        sessionFactory=config.buildSessionFactory(serviceRegistry);
        //创建会话对象
        session=sessionFactory.openSession();
        //开启事务
        transaction=session.beginTransaction();



    }

    @After
    public void destroy(){
        transaction.commit();
        session.close();
        sessionFactory.close();
    }
}

以上是测试类，

<?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">
<hibernate-configuration>
    <session-factory>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql//localhost:3306/hibernate?useUnicode=true?characteEncoding=UTF-8</property>
        <property name="connection.username">root</property>
        <property name="connection.password"></property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>

        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <property name="hbm2ddl.auto">create</property>

        <mapping resource="mapper/Student.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

hibernate配置文件

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

<hibernate-mapping>
    <class name="entity.Students" table="students">
        <id name="sid" type="int">
            <column name="SID"/>
           <generator class="assigned"/>
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME"/>
        </property>
        <property name="gender" type="java.lang.String">
            <column name="GENDER"/>
        </property>
        <property name="birthday" type="java.util.Date">
            <column name="BIRTHDAY"/>
        </property>
        <property name="address" type="java.lang.String">
            <column name="ADDRESS"/>
        </property>
    </class>

</hibernate-mapping>

对象关系映射文件。
到这里看起来似乎是没有问题的。但是如果就这样去测试，会发生异常：org.hibernate.MappingException: Unknown entity
因为我使用的hibernate版本和教学视频中使用的并不一致。需要修改的部分如下：

public void init(){
        //创建服务注册对象
        ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().configure().build();
        //创建会话工厂
        sessionFactory=new MetadataSources(serviceRegistry).buildMetadata().buildSessionFactory();
        //创建会话对象
        session=sessionFactory.openSession();
        //开启事务
        transaction=session.beginTransaction();


    }