hibernate Unknown entity错误，google,baidu后无法解决，求助

2017-02-27 09:28:00 223 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Java实体与Map转换全解析：从反射、序列化库到性能优化实践在Java开发中，对象与字典结构的相互转换是数据处理的基础操作，涉及序列化、ORM映射和动态配置等核心场景。其原理在于桥接强类型的对象世界与弱类型的字典世界，需要在类型安全、性能与灵活性之间取得平衡。这项技术的价值在于提升代码的通用性和动态处理能力，是构建灵活数据管道的关键。实践中，开发者常面临反射性能陷阱、类型转换异常等挑战。通过对比手动编码、反射工具、Jackson/Gson等序列化库以及Spring/Hutool框架方案的优劣，可以针对不同场景选择最优解。例如，在需要处理JSON交互和高性能序列化的微阅读详情

情况如图

代码：
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.url">jdbc:sqlserver://localhost:1433;DatabaseName=mysql</property>  

        <property name="connection.username">sa</property>  

        <property name="connection.password">12345</property>  

        <property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property>  

        <property name="dialect">org.hibernate.dialect.SQLServerDialect</property> 

        <property name="show_sql">true</property> 

        <property name="format_sql">true</property>

         <property name="dialect">org.hibernate.dialect.SQLServerDialect</property>

         <mapping  resource="User.hbm.xml"/>

         <mapping class="hibernate_test.User"/>

    </session-factory>

</hibernate-configuration>

User.hbm.xml 代码：



<?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 Feb 24, 2017 9:07:02 PM by Hibernate Tools 3.5.0.Final -->

<hibernate-mapping>

    <class name="hibernate_test.User" table="USER">

        <id name="id" type="int">

            <column name="ID" />

            <generator class="assigned" />

        </id>

        <property name="name" type="java.lang.String">

            <column name="NAME" />

        </property>

        <property name="password" type="java.lang.String">

            <column name="PASSWORD" />

        </property>

    </class>

</hibernate-mapping>

HibernateUtil代码



package hibernate_test;





import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import org.hibernate.service.ServiceRegistry;





public class HibernateUtil {

	private static final ThreadLocal<Session> threadlocal=new ThreadLocal<Session>();

	private static SessionFactory sessionFactory=null;

	private static ServiceRegistry serviceRegistry =null;

	static{

		   try {

	            // Create the SessionFactory from hibernate.cfg.xml

	            Configuration configuration = new Configuration();

	            configuration.configure("hibernate.cfg.xml");

	            System.out.println("Hibernate Configuration loaded");

	            

	           // configuration.addClass(hibernate_test.User.class);

	         // Read mappings as a application resourceName

	          // addResource is for add hbml.xml files in case of declarative approach

	         configuration.addResource("User.hbm.xml");  //

  

	            //apply configuration property settings to StandardServiceRegistryBuilder

	            serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();

	            System.out.println("Hibernate serviceRegistry created");

	             

	             sessionFactory = configuration

	                                .buildSessionFactory(serviceRegistry);

	        }

	        catch (Throwable ex) {

	            // Make sure you log the exception, as it might be swallowed

	            System.err.println("Initial SessionFactory creation failed." + ex);

	            throw new ExceptionInInitializerError(ex);

	        }

	    }

	/**

	 * attain session

	 * @return Session

	 * @throws HibernateException

	 */

	public static Session getSession() throws HibernateException{

		Session session=(Session) threadlocal.get();

		if(session==null||!session.isOpen()){

			if(session==null){ 

				rebuildSessionFactory();

			}

			session=(sessionFactory!=null)?sessionFactory.openSession():null;

			threadlocal.set(session);

		}

		System.out.println("***crating session");

		return session;

	}

	/**

	 * rebuild SessionFactory

	 */

	public static void rebuildSessionFactory(){

		try{

				Configuration configuration=new Configuration().configure();

				

				sessionFactory=configuration .buildSessionFactory(serviceRegistry);

		}catch(Exception e){

			System.err.println("build sessionFactory fail");

			e.printStackTrace( );

		}

	}

	/**

	 * attain object of  SessionFactory 

	 * @return object of SessionFactory

	 */

	public static SessionFactory getSessionFactory(){

		return sessionFactory;

	}

	/**

	 * close Session

	 * @throws HibernateException

	 */

	public static void closeSession() throws HibernateException{

		Session session=(Session) threadlocal.get();

		threadlocal.set(null);

		if(session!=null)

			session.close();

	}

}

MainTest代码：



package hibernate_test;



import org.hibernate.Session;



public class MainTest {



	public static void main(String[] args) {

		User user=new User();

		user.setId(123);user.setName("Rosand");user.setPassword("admin");

		Session session=null; 

		try{

			session=HibernateUtil.getSession();

			session.beginTransaction(); 

			session.save(user);

			session.getTransaction().commit();

			System.out.println("success"); 

		}catch(Exception e){

			session.getTransaction().rollback();

			System.out.println("fail"); 

			e.printStackTrace( );

		}finally{

			HibernateUtil.closeSession();

		}

	}



}