Hello everybody,
I´m a little bit confused about using the conversation context in a backing
bean.
I have the following facelet code:
| <ui:define name="body">
|
| <h:messages globalOnly="true" styleClass="message" />
| <h:form id="panel" >
| <h:panelGrid columns="1">
|
| <h:panelGroup>
| <h:selectOneMenu
valueChangeListener="#{selectItemFacade.handleItemTypeChange}"
onchange="submit()">
| <f:selectItems
value="#{selectItemFacade.availableItemTypes}" />
| </h:selectOneMenu>
| </h:panelGroup>
|
| <h:panelGroup>
| <h:panelGrid
binding="#{selectItemFacade.selectedItemPreview}" />
| </h:panelGroup>
|
| <h:panelGroup>
| <h:commandButton id="edit_button"
action="#{selectItemFacade.edit}" />
| </h:panelGroup>
|
| </h:panelGrid>
| </h:form>
| </ui:define>
| </ui:composition>
|
As you can see, some components are generated based on the selection made in
the selectOneMenu. That works fine.
| @Stateful
| @Scope(ScopeType.CONVERSATION)
| @Name("selectItemFacade")
| public class SelectItemFacadeBean implements SelectItemFacade {
|
| @Logger
| Log log;
|
| // Bijection
| @Out()
| ItemDescription selectedItemType;
| @Out(required=false)
| Item item;
|
| // Instance
| HtmlPanelGrid selectedItemPreview;
|
| @Create
| public void init() {
| this.selectedItemPreview =
(HtmlPanelGrid)FacesContext.getCurrentInstance().getApplication().createComponent(HtmlPanelGrid.COMPONENT_TYPE);
| this.selectedItemType =
ItemRegistry.INSTANCE.getDefaultItemDescription();
| updateSelectedItemComponents();
| }
|
| private void updateSelectedItemComponents() {
| if (this.selectedItemType != null && this.selectedItemPreview
!= null) {
|
selectedItemType.getPreviewComponent(FacesContext.getCurrentInstance(),
this.selectedItemPreview, this.item);
| }
| }
|
| public Item getItem() {
| return item;
| }
|
| public void setItem(Item item) {
| this.item = item;
| }
|
| public SelectItem[] getAvailableItemTypes() {
| return ItemRegistry.INSTANCE.getAvailableTypesAsSelectItem();
| }
|
| public ItemDescription getSelectedItemType() {
| return selectedItemType;
| }
|
| public void setSelectedItemType(ItemDescription selectedItemType) {
| this.selectedItemType = selectedItemType;
| }
|
| public HtmlPanelGrid getSelectedItemPreview() {
| return selectedItemPreview;
| }
|
| public void setSelectedItemPreview(HtmlPanelGrid selectedItemPreview) {
| this.selectedItemPreview = selectedItemPreview;
| }
|
| // Actions
| public void handleItemTypeChange(ValueChangeEvent evt) {
| ItemDescription desc =
ItemRegistry.INSTANCE.getDescription((String)evt.getNewValue());
| if (desc != null) {
| this.selectedItemType = desc;
| updateSelectedItemComponents();
| log.debug("Item type changed to " +
this.selectedItemType.getLabel());
| }
| }
|
| public String edit() {
| log.debug("Action: edit called;");
|
| if (this.selectedItemType != null && this.item == null) {
| log.debug("Creating " + selectedItemType.getLabel() +
" and getting edit Component;");
| this.item = selectedItemType.createItemInstance();
|
//selectedItemType.getEditComponent(FacesContext.getCurrentInstance(),
this.selectedItemEditor, this.item, "createItemFacade.item.tags");
| }
|
| return NavCodes.ACTION_EDIT;
| }
|
| @Destroy @Remove
| public void destroy() { }
|
| }
|
In the selectItemFacade component I want to outject the selectedItemType and
the item to the session context, as the instances are needed for editing in
another component.
Futher I thougth outjecting selectedItemPreview isn´t needed as the instance is
private to the stateful session bean.
If I enter select.xhtml everything works fine for the moment. But if I click on
the edit_button the page is redirected to the seam debug page and in the
logfile there is the following error:
| 08:26:51,406 ERROR [SeamExceptionFilter] uncaught exception
| javax.servlet.ServletException: /item/select.xhtml @23,71
binding="#{selectItemFacade.selectedItemPreview}": Target Unreachable,
identifier 'selectItemFacade' resolved to null
|
Why is the instance in the stateful session bean now null.
Can somebody explain me, what I´m doing wrong? I already placed a @Begin
annotation on the edit() method. No effect.
Thank you in advance.
Regards
---
Joachim
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4017459#4017459
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4017459
_______________________________________________
jboss-user mailing list
[email protected]
https://lists.jboss.org/mailman/listinfo/jboss-user
