Hibernate/Spring：即使在 Service 方法上使用 @Transactional，会话在检索子集合之前仍然关闭

Spring/Hibernate 专家您好！

在这样的时候，我希望你成为我最好的朋友。我正在使用 hibernate 3.6.1 开发一个项目。使用会话和 spring 3.0.5 实现最终的 JPA。使用 maven 发布。所以使用 maven 项目分为 3 个模块模型模块、服务模块和webapp模块。

模型 applicationContext 的片段在哪里

       <!-- Transaction Management    -->
<tx:annotation-driven transaction-manager="transactionManager" />

<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>

<!-- Model -->
<bean id="genericDAO" class="com.blabla.blabla.model.dao.hibernate.HibernateGenericDAOImpl" abstract="true">
    <property name="sessionFactory" ref="sessionFactory" />
</bean>



<bean id="content" class="com.blabla.blabla.model.ContentImpl" scope="prototype" />

<bean id="contentDAO" class="com.blabla.blabla.model.dao.hibernate.ContentDAOImpl" parent="genericDAO">
    <constructor-arg>
        <value>com.blabla.blabla.model.ContentImpl</value>
    </constructor-arg>
</bean>

我还将在关系上放置一个映射片段，这让我现在做噩梦，所以我不会在这里转储所有内容：

//ContentImpl
@Id
@Column(name = "CONTENT_ID")
private Long ID;
@Version
@Column(name = "OBJ_VERSION")
private int version = 0;
//.... other properties

@OneToMany(targetEntity = ContentImageImpl.class,cascade = {CascadeType.ALL},orphanRemoval = true)
@JoinColumn(name = "CONTENT_ID", referencedColumnName = "CONTENT_ID")
private Set<ContentImage> images = new HashSet<ContentImage>();

//ContentImageImpl
@Id @GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name = "CONTENT_IMAGE_ID")
private Long ID;

@Column(name = "PATH")
private String path;

@Column(name ="IS_DEFAULT")
private Boolean isDefault;
//no other relations


//ContentServiceImpl
 public class ContentServiceImpl implements ContentService {
//wired from application context
private ContentDAO contentDao;
private static Logger logger = Logger.getLogger(ContentServiceImpl.class);

@Transactional
public List<Content> getContentsbyCategoryID(Long categoryId) {
    return getContentDao().getbyCategoryID(categoryId);
}


@Transactional
public List<Content> getContentsWithImagesbyCategoryID(Long categoryId) {
//return getContentDao().getbyCategoryID(categoryId);
    return getContentDao().getWithImagesbyCategoryID(categoryId);



//ContentDAOImpl
 public List<Content> getbyCategoryID(Long category_id) {
    Category cat = modelManager.createCategory();
    cat.setID(category_id);
    logger.info("calling  getbyCategoryID");
    logger.debug(category_id);
    List<Content> session =  this.getSessionFactory().getCurrentSession().createCriteria(this.getPersistentClass())
            .add(Restrictions.eq("category",(CategoryImpl)cat))
            .setProjection(Projections.distinct(Projections.id()))
            .list();
    logger.debug(session);
    return session;
}

所以在评估的时候contentService.getContentbyCategoryId(longid)它抛出

org.hibernate.LazyInitializationException: failed to lazily initialize a collection of  role: com.bla.bla.model.ContentImpl.contentFiles, no session or session was closed

真的让我很困扰，我所做的唯一临时修复是将这个关联标记为急切获取，这是不可以的。我认为将 @transactional 放在服务方法之上会在没有打开任何会话时负责打开新会话？

请提供建议并感谢您阅读本文

渲染视图时会发生这种情况吗？ 如果是这种情况，您可能需要考虑使用 Spring 的OpenSessionInViewFilter。这会将会话绑定到线程以完成请求的整个处理。如果使用 JPA 你可以使用OpenEntityManagerInViewFilter.

在您的 web.xml 中：

<filter>
    <filter-name>OpenSessionInViewFilter</filter-name>
    <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
    <init-param>
        <param-name>sessionFactoryBeanName</param-name>
        <param-value>sessionFactory</param-value>
    </init-param>
</filter>

<filter-mapping>
    <filter-name>OpenSessionInViewFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>