init Page with @Factory, @Create, @Startup

[nimo22]

How can I initialize a (xhtml)-page with a value coming from a list without invoking an explicit client-action?

I want to show a list of data automatically, when the user visits a page.

With @Factory, @Create-Annotation?

@Factory
public List <Persons> initProducts () 
{return showAllPersonsAtStartup = entityManager.createQuery("select name from Person").getResultList();
}

when the user comes to that page, the page should automatically renders a datatable and shows the result of the list 'showAllPersonsAtStartup':

<h:dataTable value="#{showAllPersonsAtStartup}" var="person">
<h:column>
<h:outputText value="#{person}"/>
</h:column>
</h:dataTable>

And when the user clicks to a 'SelectOneMenu' with the Seam-Tag s:selectItems:

<s:label>Select Person: </s:label>
<h:selectOneMenu id="selectOneShift">
  <s:selectItems value="#{showAllPersonsAtStartup}"/>
</h:selectOneMenu>     

How can I do that?

[nickarls]

Well, @Factory(foo) should be called if foo is referenced and is found to be null so that's a starting point.

You could check out ShowOrdersAction in the dvdstore example.

[gena]

You did it already. Try

@Factory("showAllPersonsAtStartup") // not the best name for an entity collection

and use an entity converter for s:selectItems if you wish to know a selection.

[nimo22]

Okay the @Factory works well with that:

my view:

<s:label styleClass="label">Products: </s:label>
<h:selectOneMenu >
<s:selectItems value="#{initProducts}" var="product" label="#{product[1]}" />
</h:selectOneMenu>

my session bean:

private List <Product> listProduct;

@Factory("initProducts")
public List <Product> initProducts() {
         
return listProduct = entityManager.createQuery("select id, description, price from Product").getResultList();
}

The

label="#{product[1]

put the data of the field 'description' in the 'selectOneMenu'. This works well.

BUT this does not work:

my view:

<s:label styleClass="label">Products: </s:label>
<h:selectOneMenu >
<s:selectItems value="#{initProducts}" var="product" label="#{product.description}" />
<s:convertEntity />
</h:selectOneMenu>

my session bean:

private Product product;
public void setProduct(Product product) {
        this.product = product;
}

public Product getProduct() {
     return product;
}
private List <Product> listProduct;

@Factory("initProducts")
public List <Product> initProducts() {
         
return listProduct = entityManager.createQuery("select id, description, price from Product").getResultList();
}

This stacktrace occurs:

ERROR [viewhandler] Error Rendering View[/Product.xhtml]
java.lang.NumberFormatException: For input string: "description"

Product is still an entity. What is wrong?