[jboss-user] [JBoss Seam] - How to impliment a Paged + Sorted DataTable (session) withou

antispart do-not-reply at jboss.com
Wed Nov 15 14:21:35 EST 2006

I have what must be a fairly typical usecase.

1. User starts at search / list page.
2. Selects an object from list and modifies it
3. Returns to search / list page.

Now, I can get this to work with something similar to the Booking example. 


    private List sessions;

    public String find()   {
	return null;

Another SFSB:
    public String create() {

The problem lies when the backing data is modified outside the application or by another user and hence the "dataChanged" event is never fired, the @Observer on the find() method is never triggered and the data is stale upon subsequent requests.

Now, this problem goes away if I stick the SFSB that outjects the @DataModel into Event Scope, but then things like sort order and number of rows gets lost between requests.

So, I thought maybe using PAGE scope for the @DataModel and Session Scope for the SFSB that outjects the @DataModel, but the factory method on the @DataModel still doesnt get invoked when the page is loaded the 2nd time. And, obviously, a paged scoped Action bean cannot be stateful.

So, I'm not quite sure what to do. I know I can , for example, put an object in session scope that tracks sort order, etc for each list but that feels pretty ugly. 

Is there an excepted pattern for this?

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