Question

我正在尝试配置hibernate和tomcat，以便tomcat将管理数据库连接，但是我遇到了一些错误。
你能帮忙吗？这是我的代码：
这是HibernateUtil

public class HibernateUtil {  
private static final SessionFactory sessionFactory = buildSessionFactory();  

private static SessionFactory buildSessionFactory() {  
    try {  
        // Create the SessionFactory from hibernate.cfg.xml  
        return new AnnotationConfiguration().configure().buildSessionFactory();  

    } 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;  
}  

public static void shutdown() {  
    // Close caches and connection pools  
    getSessionFactory().close();  
}  
}

HibernateListener：

public class HibernateListener implements ServletContextListener {

/*  public void contextInitialized(ServletContextEvent event) {
    HibernateUtil.getSessionFactory(); // Just call the static initializer
                                        // of that class
}

public void contextDestroyed(ServletContextEvent event) {
    HibernateUtil.getSessionFactory().close(); // Free all resources
}
}*/

@Override  
public void contextInitialized(ServletContextEvent arg0) {  
    System.out.println("\n\tInside contextInitialized()\n")
    Session session = HibernateUtil.getSessionFactory().openSession();  
    session.beginTransaction();  
}  

@Override  
public void contextDestroyed(ServletContextEvent arg0) {  

    HibernateUtil.shutdown();         
}  
}

我还在web.xml中创建了一个条目

  <listener>
<listener-class>hibernate.HibernateListener</listener-class>
</listener>

我创建了一个jsp文件并尝试运行一段代码，即：

public Employee getEmployeeByLogin(String login){
    Employee p= null;
    Session session = HibernateUtil.getSessionFactory().getCurrentSession();
    Query query = session.createQuery("from employee p where p.login = '" + login +"'");
    p = (Employee) query.uniqueResult();
    return p;
}

我得到的错误是：

org.apache.jasper.JasperException: org.hibernate.HibernateException: createQuery is   not valid without active transaction

我尝试按https://community.jboss.org/wiki/UsingHibernateWithTomcat#中描述的方式进行，但没有成功...... 再一次。请帮忙。

java hibernate tomcat配置 - 会话不会被打开

0 个答案: