使用hibernate报错，Unknown entity: com.miao.bean.Person，谁能帮忙看下啊

[pheonix0992]

hibernate.cfg.xml文件内容如下：

<?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="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.password">12345</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/test</property>
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">update</property>
        
        <mapping resource="com/miao/bean/Person.hbm.xml"></mapping>
    </session-factory>
</hibernate-configuration>

Person类如下：

package com.miao.bean;

public class Person {
	private Long id;
	
	private String name;
	
	private Integer age;
	
	public Person(){}

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

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

	public Integer getAge() {
		return age;
	}

	public void setAge(Integer age) {
		this.age = age;
	}
}

Person.hbm.xml对应内容如下：

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated 2017-4-20 10:01:58 by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
    <class name="com.miao.bean.Person" table="PERSON">
        <id name="id" type="java.lang.Long">
            <column name="ID" />
            <generator class="native" />
        </id>
        <property name="name" type="java.lang.String">
            <column name="NAME" />
        </property>
        <property name="age" type="java.lang.Integer">
            <column name="AGE" />
        </property>
    </class>
</hibernate-mapping>

测试类PersonDao

package com.miao.dao;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;

import com.miao.bean.Person;

public class PersonDao {
	private static SessionFactory sessionFactory = null;
	
	public static void main(String[] args) {
		createSessionFactory();
		Session session = sessionFactory.openSession();
		session.beginTransaction();
		Person person = new Person();
		person.setAge(18);
		person.setName("miao");
		session.save(person);
		session.getTransaction().commit();
		session.close();
	}

	private static SessionFactory createSessionFactory() {
		// TODO Auto-generated method stub
		Configuration cfg = new Configuration().configure();
		System.out.println("cfg.getProperties():" + cfg.getProperties());
		StandardServiceRegistry build = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
		sessionFactory = cfg.buildSessionFactory(build);
		return sessionFactory;
	}
}

pom依赖项

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.miao.test</groupId>
  <artifactId>hibernate2</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>
  <name>hibernate2 Maven Webapp</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    
	<dependency>
    	<groupId>mysql</groupId>
    	<artifactId>mysql-connector-java</artifactId>
    	<version>5.1.38</version>
	</dependency>
    
	<dependency>
    	<groupId>org.hibernate</groupId>
    	<artifactId>hibernate-core</artifactId>
    	<version>5.2.9.Final</version>
	</dependency>
  </dependencies>
  <build>
    <finalName>hibernate2</finalName>
  </build>
</project>

项目目录结构

[nikyotensai]

修改Person类。

package com.miao.bean;
import javax.persistence.Entity;

 @Entity
public class Person {
    private Long id;
     
    private String name;
     
    private Integer age;
     
    public Person(){}
 
    public Long getId() {
        return id;
    }
 
    public void setId(Long id) {
        this.id = id;
    }
 
    public String getName() {
        return name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    public Integer getAge() {
        return age;
    }
 
    public void setAge(Integer age) {
        this.age = age;
    }
}

没有实际试验，还不行就把@Table,@Id,@Column都加上

[pheonix0992]

我这没有使用注释的方法啊，我先使用配置文件的试下，现在就报这个错，死活找不到Person类，有哪位大神可以帮忙解决下

[pheonix0992]

错误堆栈：

Exception in thread "main" org.hibernate.MappingException: Unknown entity: com.miao.bean.Person
	at org.hibernate.metamodel.internal.MetamodelImpl.entityPersister(MetamodelImpl.java:620)
	at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1627)
	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:682)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:674)
	at org.hibernate.internal.SessionImpl.save(SessionImpl.java:669)
	at com.miao.dao.PersonDao.main(PersonDao.java:21)

[pheonix0992]

谁能帮忙看下啊

[110成成]

你去save的时候主键没有赋值，难道是自增的吗? 如果是自增的话，表的主键你有没有设置自增。

[pheonix0992]

我设置的是native，跟这个没有太多的关系把。我刚才把id设置了，还是报一样的错误。