更新 JSF 模型不起作用

Question

我有以下几点：

查看：

<h:form class="form-signin">

<h:inputText id="name" name="name" value="#{userCabinetController.user.name}" required="true" requiredMessage="Поле имя не заполнено" class="form-control" type="name"/>

<h:inputText id="email" name="email" value="#{userCabinetController.user.email}" required="true" requiredMessage="Введите логин (email)" class="form-control" type="email"/>

<h:inputSecret id="password" name="password" value="#{userCabinetController.user.password}" required="true" requiredMessage="Введите пароль" class="form-control" type="password"/>

<h:commandButton action="#{userCabinetController.updateUser}" value="Изменить данные" class="btn btn-lg btn-primary btn-block"/>

</h:form>

控制器：

@Named
@ViewScoped
public class UserCabinetController {

@PostConstruct
public void init() {
    /**
     * get user instance for further updating
     */
    ExternalContext externalContext = FacesContext.getCurrentInstance().getExternalContext();
    Map<String, Object> sessionMap = externalContext.getSessionMap();
    User userFromSession = (User) sessionMap.get("user");
    int userId = userFromSession.getId();
    user = userFacade.finById(userId);
}

private User user;

@Inject
UserFacade userFacade;

public void updateUser() {
    System.out.println(user);
    userFacade.updateUser(user);
}

// getters/setters
public User getUser() {
    return user;
}

public void setUser(User user) {
    this.user = user;
}
}

和立面：

@ApplicationScoped
public class UserFacadeImpl implements UserFacade, Serializable{

    @PersistenceContext
    private EntityManager em;

@Transactional
    public void updateUser(User user) {
        em.merge(user);
    }
   }

但是当我尝试更新用户实例时，它给出了相同的实例，即旧实例没有给出新值。

如何更新用户实例？怎么了？

Answer 1

UserFacadeImpl.updateUser() 应该将更新后的用户对象传回给控制器：

@Named
@ViewScoped
public class UserCabinetController {

  public void updateUser() {
    System.out.println(user);
    user = userFacade.updateUser(user);
  }
}

@ApplicationScoped
public class UserFacadeImpl implements UserFacade, Serializable {

public User updateUser(User user) {
        user = em.merge(user);
        return user;
    }
}