当我在 Rich:dataTable 中加载延迟加载列表时,我总是收到“未能延迟初始化角色集合”错误。
这当然是因为会话在此状态下关闭。
我的问题如何仅使用 JPA(无弹簧等)来使用会话。我真的需要 HibernateUtil 的东西还是 Hibernate.Initialize(..)。我宁愿不使用这个 Hibernate 特定的东西,只是简单的 JPA。并且没有 EAGER 获取。
我当前的代码:
实体:
@SuppressWarnings("serial")
@Entity
@Table(name = "user", uniqueConstraints = {
@UniqueConstraint(columnNames = "username"),
@UniqueConstraint(columnNames = "email")})
public class User implements Serializable {
...
@OneToMany(mappedBy="user", fetch=FetchType.LAZY)
private List<UserTournament> userTournament = new ArrayList<UserTournament>();
...
}
道:
@Stateless(name = "usercontroller")
public class UserController implements UserControllerInterface {
@PersistenceContext
private EntityManager em;
...
@Override
public List<UserTournament> getUserTournaments(Integer userid) {
User user = loadUser(userid);
return user.getUserTournament();
}
...
}
命名豆:
@Named("myTournBean")
@ViewScoped
public class MyTournamentsBean implements Serializable {
@EJB
private UserControllerInterface userController;
private List<UserTournament> tournaments;
...
@PostConstruct
public void init() {
...
tournaments = userController.getUserTournaments(userid);
}
...
}
xhtml:
<h:panelGrid columns="3" columnClasses="titleCell">
<rich:dataScroller for="table" maxPages="5" />
<rich:dataTable value="#{myTournBean.tournaments}" var="tourn"
id="table" rows="10">
<rich:column>
<f:facet name="header">
<h:outputText value="Id" />
</f:facet>
<h:outputText value="#{tourn.id}" />
</rich:column>
</rich:dataTable>
<rich:dataScroller for="table" maxPages="5" />
</h:panelGrid>
编辑:
@BoristheSpider的链接表格非常有帮助。我还没有完全通过它,但这已经解决了我的问题:
@Stateful
@ConversationScoped
public class Service
{
@PersistenceContext(type = PersistenceContextType.EXTENDED)
private EntityManager em;
}