hibernate5.x做xml映射运行报错，找不到实体

报错：

INFO: HHH10001001: Connection properties: {user=root, password=****}
七月 02, 2016 9:44:23 下午 org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
七月 02, 2016 9:44:23 下午 org.hibernate.engine.jdbc.connections.internal.PooledConnections 
INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
Sat Jul 02 21:44:23 CST 2016 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requirements SSL connection must be established by default if explicit option isn't set. For compliance with existing applications not using SSL the verifyServerCertificate property is set to 'false'. You need either to explicitly disable SSL by setting useSSL=false, or set useSSL=true and provide truststore for server certificate verification.
七月 02, 2016 9:44:23 下午 org.hibernate.dialect.Dialect 
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLInnoDBDialect
Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.wxmimperio.pojo.User
    at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:620)
    at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1596)
    at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104)
    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:668)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:660)
    at org.hibernate.internal.SessionImpl.save(SessionImpl.java:655)
    at HibernateTest.main(HibernateTest.java:34)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)

*.cfg.xml

    
        
        com.mysql.jdbc.Driver
        jdbc:mysql://localhost:3306/my_hibernate
        root
        root
        
        org.hibernate.dialect.MySQLInnoDBDialect
        
        
    

*.hbm.xml

实体类User

package com.wxmimperio.pojo;

public class User {
    private int id;
    private String username;
    private String password;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
}

Test主程序

import com.wxmimperio.pojo.User;
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;

public class HibernateTest {
    public static void main(String args[]) {
        Configuration cfg = new Configuration().configure();
        ServiceRegistry registry = new StandardServiceRegistryBuilder()
                .applySettings(cfg.getProperties()).build();
        SessionFactory sf = cfg.buildSessionFactory(registry);
        Session session = sf.openSession();
        Transaction ts = session.beginTransaction();
        User user = new User();
        user.setUsername("wxmimperio");
        user.setPassword("123456");
        session.save(user);
        ts.commit();
        session.close();
    }
}