我有这个问题:
org.hibernate.LazyInitializationException:懒得初始化角色集合:mvc3.model.Topic.comments,没有会话或会话被关闭
这是模型:
@Entity
@Table(name = "T_TOPIC")
public class Topic {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;
@ManyToOne
@JoinColumn(name="USER_ID")
private User author;
@Enumerated(EnumType.STRING)
private Tag topicTag;
private String name;
private String text;
@OneToMany(mappedBy = "topic", cascade = CascadeType.ALL)
private Collection<Comment> comments = new LinkedHashSet<Comment>();
...
public Collection<Comment> getComments() {
return comments;
}
}
调用模型的控制器如下所示:
@Controller
@RequestMapping(value = "/topic")
public class TopicController {
@Autowired
private TopicService service;
private static final Logger logger = LoggerFactory.getLogger(TopicController.class);
@RequestMapping(value = "/details/{topicId}", method = RequestMethod.GET)
public ModelAndView …我有下一个错误: nested exception is org.hibernate.LazyInitializationException: failed to lazily initialize a collection of role: com.example.Model.entities, could not initialize proxy - no Session
我的Model实体:
class Model {
...
@OneToMany(fetch = FetchType.LAZY, mappedBy = "model", orphanRemoval = true)
@Cascade(CascadeType.ALL)
@Fetch(value = FetchMode.SUBSELECT)
public Set<Entity> getEntities() {
return entities;
}
public void addEntity(Entity entity) {
entity.setModel(this);
entities.add(entity);
}
}
我有一个服务类:
@Service
@Transactional
class ServiceImpl implements Service {
@Override
public void process(Model model) {
...
model.addEntity(createEntity());
...
}
}
我正在使用其他服务方法调用服务:
@Override
@JmsListener(destination = …