hibernat延迟加载的问题，高手帮看下

Question

现有一个一对多，我配置了lazy="true"，已经设置了OpenSessionInViewFilter，但是调用时出现一些错误

现有代码如下

             Theme theme=((Users)session.get("user")).getTheme();       

    System.out.println("theme.getThemePath()="+theme.getThemePath());//此处打印出来是有值的，theme不为空

    Set set=theme.getUsers();

    Iterator it=set.iterator();

    while(it.hasNext()){

        Users user=(Users) it.next();

        String username=user.getUsername();

        System.out.println(username);                       
    }

执行报错：
org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.struts2.entity.Theme.users, no session or session was closed

但是我改成如下：却可以正常运行，

    Theme theme=new Theme();    
        theme.setId(1);         
    theme=facadeService.themeService.getThemeFormDB(1);

            System.out.println("theme.getThemePath()="+theme.getThemePath());

    Set set=theme.getUsers();

    Iterator it=set.iterator();

    while(it.hasNext()){

        Users user=(Users) it.next();

        String username=user.getUsername();

        System.out.println(username);                       
    }

上面如何才能应用延迟加载？谢谢！

Answer 1

Theme theme=((Users)session.get("user")).getTheme(); 此步从session中获得user，再从user中获得theme应该都不在当前session中，所以无法再通过懒加载获得theme的user
请参考