为什么AnnotationConfiguration不推荐使用AnnotationConfiguration实例？ [英] Why am I getting AnnotationConfiguration instance is required when AnnotationConfiguration is deprecated?

问题描述

使用Hibernate 4.2.6和Spring 3.1.1

我有一个类似于这个

  @Entity 
 @Table（name =MY_TABLE）
 public class MyTable {...} 
  

然后我在我的hibernate.cfg.xml文件中有以下内容：

 < mapping class =com.mycompany.myapp.persistence.domain.MyTable/> 
  

当我运行一个JUnit测试时，我得到一个Session并查询该表时，出现以下错误：

 创建初始SessionFactory failed.org.hibernate.MappingException：需要使用AnnotationConfiguration实例来使用< mapping class =com .mycompany.myapp.persistence.domain.MyTable/> 
  

我不明白为什么什么时候，基于我读过的内容，AnnotationConfiguration已被弃用，进入配置。

为了获得会话，我正在这样做

  Configuration configuration = new Configuration（）; 
 configuration.configure（）; 
 ServiceRegistry serviceRegistry = new ServiceRegistryBuilder（）。applySettings（configuration.getProperties（））。buildServiceRegistry（）; 
 sessionFactory = configuration.buildSessionFactory（serviceRegistry）; 
 Session session = sessionFactory.openSession（）; 
  

但它无法获取会话并引发此错误。

解决方案

似乎现在正在工作。解决方案有两方面：

第一，这段代码是正确的：

映射类仍然保留在hibernate.cfg.xml中b）创建一个HibernateUtil类b
$ b

  
 
 创建一个HibernateUtil类
 code> public class HibernateUtil {
 
 private static final SessionFactory sessionFactory = buildSessionFactory（）; 
 
 private static SessionFactory buildSessionFactory（）{
 try {
 //从hibernate.cfg.xml创建SessionFactory 
 Configuration configuration = new Configuration（）; 
 configuration.configure（）; 
 ServiceRegistry serviceRegistry = new ServiceRegistryBuilder（）。applySettings（configuration.getProperties（））。buildServiceRegistry（）; 
 return configuration.buildSessionFactory（serviceRegistry）; 
} 
 catch（Throwable ex）{
 //确保您记录异常，因为它可能被吞噬
 System.err.println（初始化SessionFactory创建失败。 + ex）; 
抛出新的ExceptionInInitializerError（ex）; 
 
 
 
 public static SessionFactory getSessionFactory（）{
 return sessionFactory; 
 
 
 
 
 
 
创建Model类$ / $ 
 
 然后在测试中，像这样在setup（）中实例化sessionFactory  
 
 
  sessionFactory = HibernateUtil.getSessionFactory（）; 
  
 
 
 然后像这样查询数据库
  Session session = sessionFactory.openSession（）; 
 session.beginTransaction（）; 
列表< TableName> result = session.createQuery（from table）。list（）; 
 session.getTransaction（）。commit（）; 
 session.close（）; 
  
 第二，我使用JBoss 4.2作为我的目标运行时，在使用Hibernate 3.4.2之前，此AnnotatedConfiguration类已被弃用。没有将JBoss作为运行时目标，导致使用Hibernate 4.2.6（通过Maven导入）并且不会导致此错误。 Hibernate在创建它的版本时应该更加注意！ ： - ） 
Using Hibernate 4.2.6 and Spring 3.1.1

I have one class similar to this
@Entity
@Table( name = "MY_TABLE" )
public class MyTable{ ... }
Then I have the following in my hibernate.cfg.xml file
<mapping class="com.mycompany.myapp.persistence.domain.MyTable"/>
When I run a JUnit test where I get a Session and query the table, I get the following error:
Initial SessionFactory creation failed.org.hibernate.MappingException: An AnnotationConfiguration instance is required to use <mapping class="com.mycompany.myapp.persistence.domain.MyTable"/>
I don't understand why when, based on what I've read, AnnotationConfiguration is deprecated and functionality moved into Configuration.

To get the Session, I'm doing this
Configuration configuration = new Configuration();
configuration.configure();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();        
sessionFactory = configuration.buildSessionFactory(serviceRegistry);
Session session = sessionFactory.openSession();
but it's unable to get the Session and throws this error.
解决方案
Seems to be working now. Solution was twofold:

First, this code is correct:

a) mapping class remains in the hibernate.cfg.xml

b) Create a HibernateUtil Class
public class HibernateUtil {

    private static final SessionFactory sessionFactory = buildSessionFactory();

    private static SessionFactory buildSessionFactory() {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            Configuration configuration = new Configuration();
            configuration.configure();
            ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();        
            return 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);
        }
    }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
}
c) Create the Model class

d) Then in the test, instantiate the sessionFactory in the setup() like this
sessionFactory = HibernateUtil.getSessionFactory();
e) Then query the database like this
Session session = sessionFactory.openSession();
session.beginTransaction();
List<TableName> result = session.createQuery("from table").list();
session.getTransaction().commit();
session.close();
Second, I was using JBoss 4.2 as my targeted runtime, which was using Hibernate 3.4.2, before this AnnotatedConfiguration class was deprecated. Not targeting JBoss as a runtime results in using Hibernate 4.2.6 (imported via Maven) and not causing this error. Should've paid better attention as Hibernate prints its version when it sets up! :-)

                        
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