我从Eclipse创建了这个项目(没有命令提示符)

Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named course
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:56)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:34)
    at message.SaveMessage.main(SaveMessage.java:8)

目录结构

我的persistence.xml

<persistence xmlns="http://java.sun.com/xml/ns/persistence"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
    version="2.0">
    <persistence-unit name="course" transaction-type="RESOURCE_LOCAL">
 
        <provider>org.hibernate.ejb.HibernatePersistence</provider>
 
 
        <properties>
            <property name="hibernate.dialect" value="org.hibernate.dialect.MysqL5InnoDBDialect" />
            <property name="hibernate.hbm2ddl.auto" value="update" />
 
            <property name="javax.persistence.jdbc.driver" value="com.MysqL.jdbc.Driver" />
            <property name="javax.persistence.jdbc.url" value="jdbc:MysqL://localhost:3306/StudentDB" />
            <property name="javax.persistence.jdbc.user" value="root" />
            <property name="javax.persistence.jdbc.password" value="pasapas2005" />
        </properties>
    </persistence-unit>
</persistence>

我的课

package message;
 
import java.io.Serializable;
 
import javax.persistence.*;
 
@Entity
public class Message implements Serializable {
 
    private long id;
    private String text;
 
    public Message() {
 
    }
 
    public Message(long id,String text) {
        this.setId(id);
        this.setText(text);
 
    }
 
    @Id
    public long getId() {
        return id;
    }
 
    public void setId(long id) {
        this.id = id;
    }
 
    public String getText() {
        return text;
    }
 
    public void setText(String text) {
        this.text = text;
    }
 
}

我的测试员(主要)课

package message;
 
import javax.persistence.*;
 
public class SaveMessage {
 
    public static void main(String[] args) {
        EntityManagerFactory emf = Persistence.createEntityManagerFactory("course");
        EntityManager em = emf.createEntityManager();
        EntityTransaction tx = em.getTransaction();
        tx.begin();
 
        Message message = new Message(1,"Hello world");
        em.persist(message);
        tx.commit();
        em.close();
        System.out.println("message saved");
 
    }
 
}