JSF Component binding with conversation scope seam component

[ryildirim]

I use JBoss 4.0.5, Seam 1.2.1 and a seam-gen generated application. My application uses ajax4jsf heavily and I suspect this problem might be related with the conversation propagation with the ajax4jsf requests.

When I try to use component binding
<rich:dataTable value="#{girisHome.girisHarekets}" binding="#{ajaxSupport.dataTable}".....

and ajaxSupport is like

@Name("ajaxSupport")
@Scope(ScopeType.CONVERSATION)
public class AjaxSupport {
private UIData dataTable;
......

The page loads okay for the first time, because it creates the non-existent conversation scoped ajaxSupport component and binds the jsf component to the dataTable property of the seam component. However, subsequent request to the same page results in:

javax.faces.el.PropertyNotFoundException: /GirisEdit.xhtml @206,53 binding="#{ajaxSupport.dataTable}": Target Unreachable, identifier 'ajaxSupp
at com.sun.facelets.el.LegacyValueBinding.isReadOnly(LegacyValueBinding.java:84)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:84)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:57)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:94)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:57)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:94)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:57)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:94)
at org.apache.myfaces.shared_impl.util.RestoreStateUtils.recursivelyHandleComponentReferencesAndSetValid(RestoreStateUtils.java:57)
at org.apache.myfaces.lifecycle.RestoreViewExecutor.execute(RestoreViewExecutor.java:96)
at org.apache.myfaces.lifecycle.LifecycleImpl.executePhase(LifecycleImpl.java:95)

By the way, when I change the component's scope to SESSION everything works fine.

Below is how the request is triggered from the client. An ajax4jsf request.

<h:outputText id="urunAdiText" rendered="#{not girisHareket.active}" value="#{girisHareket.urun.urunAdi}">
<a:support event="onclick" actionListener="#{ajaxSupport.onClick}" reRender="hareketPanel"/>
</h:outputText>

Any ideas what's going wrong?

[quilleashm]

There's a general rule (in the docs somewhere I think) that you should never do component bindings into a scope that lasts longer than a single request. This has been known to cause all sorts of issues in the past.

The preferred solution is to bind your components into an event scoped component and inject that into your conversation beans that need access to the binding.

I would address this first and see if that solves your problem.

Cheers.

Mike.

[christian.bauer]

The rule is to not bind a JSF component into a CONVERSATION scoped Seam component, because the conversation context is not restored yet when RESTORE VIEW is called (which is the time when JSF components are bound).

[ristretto]

The seam manual here

http://docs.jboss.org/seam/2.0.1.CR1/reference/en/html/conversations.html#d0e5171

says, alternatively to using bindings, do the following. However, I can't get this to work. uiComponent doesn't seem to exist, but I'm not sure

<h:dataTable id="lineItemTable" var="lineItem" value="#{orderHome.lineItems}">
 <h:column>
 Row: #{uiComponent['lineItemTable'].rowIndex}
 </h:column>
 ...
</h:dataTable>

Is way really possible? Is there a discussion on the implicit handles available to us using JFC, Facelets and Seam?

[plouw]

Was a solution ever found for this.  I am having exactly the same problem