Hibernate5新的创建SessionFactory方式，使用Hibernate4的方式报异常XXX is not mapped

Hibernate4创建SessionFactory的方式

Configuration configuration = new Configuration().configure();
ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder()
		 .applySettings(configuration.getProperties()).build();
SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);

Hibernate5创建SessionFactory新的方式

StandardServiceRegistry standardRegistry = new StandardServiceRegistryBuilder()
				.configure().build();
Metadata metadata = new MetadataSources(standardRegistry)
		.getMetadataBuilder()
		.applyImplicitNamingStrategy(
				ImplicitNamingStrategyJpaCompliantImpl.INSTANCE)
		.build();
SessionFactory sessionFactory = metadata.getSessionFactoryBuilder().build();

Hibernate5不再显式的使用Configuration类代表配置信息，而是新增了一个Metadata类来处理，SessionFactory的创建从Metadata实例中获得一个创建者，然后调用改创建者的build()方法获得SessionFactory。这是典型的创建者模式。
若依旧在Hibernate5中使用Hibernate4创建SessionFactory的方式，代码编译不会报错，但在运行时会抛出一个 QuerySyntaxException异常： XXX is not mapped。

这个异常信息似乎告诉我们是因为User类没有映射到数据库的表中，然而我认真检查了所有配置信息，并没有发现配错的情况。于是我把Maven依赖的Hibernate5降级到Hibernate4目前最后一个版本4.3.11，QuerySyntaxException异常没有出现，User类也正常映射到了数据库表中。我一开始还以为是Hibernate5有bug，查看文档之后才发现原来是SessionFactory的创建方式改了。

详细异常信息如下：

org.hibernate.hql.internal.ast.QuerySyntaxException: User is not mapped [from User as u where u.name = :name and u.password = :password]
	at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79)
	at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:218)
	at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:142)
	at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:115)
	at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:76)
	at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:150)
	at org.hibernate.internal.AbstractSessionImpl.getHQLQueryPlan(AbstractSessionImpl.java:302)
	at org.hibernate.internal.AbstractSessionImpl.createQuery(AbstractSessionImpl.java:240)
	at org.hibernate.internal.SessionImpl.createQuery(SessionImpl.java:1907)
	at org.jisonami.service.DataRepository.queryAll(DataRepository.java:84)
	at org.jisonami.service.UserService.validate(UserService.java:28)
	at org.jisonami.controller.account.AccountController.login(AccountController.java:40)
	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:483)
	at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:178)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:444)
	at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:432)
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:959)
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:893)
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:968)
	at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:870)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:844)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:121)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:745)

hibernate.cfg.xml配置信息，这个与hibernate4没有变化

<?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">oracle.jdbc.driver.OracleDriver</property>
        <property name="hibernate.connection.url">jdbc:oracle:thin:@192.168.75.130:1521:orcl</property>
        <property name="hibernate.connection.username">jison</property>
        <property name="hibernate.connection.password">jison</property>
        <property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
        
        <!-- 自动创建需要的数据库表 -->
        <property name="hibernate.hbm2ddl.auto">update</property>
        <!-- 在控制台打印sql语句 -->
        <property name="hibernate.show_sql">true</property>
        
        <mapping class="org.jisonami.entity.User" />
    </session-factory>
</hibernate-configuration>

而User类的配置使用的是注解的方式，这个也与Hibernate4没有变化

package org.jisonami.entity;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

import org.hibernate.annotations.GenericGenerator;

@Entity
@Table(name="t_user")
public class User implements Serializable{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	public User(){}
	@Id
	@GeneratedValue(generator="usergenerator")
	@GenericGenerator(name="usergenerator", strategy="uuid")
	private String id;
	private String name;
	private String password;
	
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
}

更详细的代码见我的Github项目： https://github.com/jisonami/Jisonami2
目前我的个人项目还比较粗糙，以后会好的。