accessing EntityManager in java action constructor

[shasho]

I want to populate a "selectOneMenu" from the database once a page is loaded
The page (XHTML) is associated with an action bean (Java)
I can not access the database in the java class constructor because there the EntityManager is null
Everything is working fine when I am calling some load function in the java from another page. However, what if this page is the first page of my site? Does anyone has an elegant solution ?

[michael.yuan]

Use a page action in pages.xml like this:


<page view-id="/foo.xhtml" action="#{boo.loadData}"/>
... ...


The method is called before your page is rendered.

[shasho]

Many thanks its working but there is a problem with ICEFACE integration

I have a java action bean with the following

@Stateful
@Scope(SESSION)
@Name("productsGrid")
public class ProductsGridAction implements ProductsGrid{

 @PersistenceContext
 private EntityManager em;
.
.
.
public void LoadData() {
 if (animalList==null) { // only first time read it from the db
 animalList = em.createQuery("select a from Animal a order by id")
 .getResultList();
 }

LoadData is called as you suggested

This action bean is connected to the following code in the facelets (XHTML)

<ice:selectOneMenu id="animals"
 value="#{productsGrid.animalID}" >
 <f:selectItems value="#{productsGrid.animalList}"/>
 </ice:selectOneMenu>

And it does show the correct list from the database

However, the following code is NOT working from the same faclets page

<ice:commandLink
 actionListener="#{productsGrid.toggleSubGroupAction}">
 <ice:outputText value="#{productsGrid.expandText}" />
 </ice:commandLink>

Now, if I remove the LoadData from the java action bean the list (ice:selectOneMenu) as expected doest show anything but the (ice:commandLink)works !

What is my problem? Why the LoadData "destroy" the " ice:commandLink"?

If I am calling LoadData from another faclets page everything is working well. Again, my problem is when the faclets is the first page of the site or I cant call him from another faclets (for example when calling it from a flash code)