java - 为什么 Hibernate session 提取在此代码段中失败？

Question

我正在试验 Hibernate 4.1.2。

编写了以下类来帮助我使用新的 ServiceRegistry 方法获得 session

============================================= ======

package com.debaself.samples;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;


public class SessionFetch {

private static SessionFactory sessionFactory = null;

public SessionFactory getSessionFactory(){

if(sessionFactory == null){
         Configuration cfg = new    AnnotationConfiguration().addResource("hibernate.cfg.xml").configure();

ServiceRegistry serviceRegistry = new     ServiceRegistryBuilder().applySettings(cfg.getProperties()).buildServiceRegistry();
        sessionFactory = cfg.buildSessionFactory(serviceRegistry);
    }

    return sessionFactory ;
}

public Session getSession(){
    return getSessionFactory().openSession();
}
}

=============================================

现在我写了一个测试

=============================================

public class SessionFetchTest {

    @Test 
    public void getSessionFactoryTest(){
        SessionFetch fetch = new SessionFetch();
        SessionFactory factory = fetch.getSessionFactory();

        assertNotNull(factory);
        assert(!factory.isClosed());
        factory.close();
    }

    @Test
    public void getSessionTest(){
        SessionFetch fetch = new SessionFetch();
        Session session = fetch.getSession();

        assert(session.isOpen());
        assert(session.isConnected());      
    }
}

============================================= ===

奇怪的是

当我单独运行测试方法时，两个测试都成功了。但是当我一次运行它们时，getSessionTest() 总是失败并抛出 UnknownServiceException。

谁能解释一下这种行为？

Answer 1

正如我在评论中所说，工厂已关闭。也许在 @AfterClass 部分关闭它？