Component Binding to conversation does not work

[scraatz]

Hi,

we are trying to bind a faces UI component to a conversation.scope Java bean with SEAM 1.0B2 and myFaces 1.1.1/facelets.
Whenever the form is postet SEAM complains that "no conversation is active" and throws an exception.

<h:inputText value="#{conversation.input}" binding="#{conversation.inputComponent}" />

Question: Am I doing something wrong? Is there a workaround?

Thanks
Stefan

P.S.:
After looking at the SEAM and myFaces source I believe that the problem is, that SEAM restores the current conversation in the AFTER_PHASE listener of RESTORE_VIEW,

 public void afterPhase(PhaseEvent event)
 {
 log.trace( "after phase: " + event.getPhaseId() );

 if ( event.getPhaseId() == RESTORE_VIEW )
 {
 restoreAnyConversationContext(event);
 }
 else if ( event.getPhaseId() == RENDER_RESPONSE )
....

and myFaces sets the bindings before calling the AFTER_PHASE listener

....
 recursivelyHandleComponentReferencesAndSetValid(facesContext, viewRoot);

 informPhaseListenersAfter(facesContext, PhaseId.RESTORE_VIEW);
....

Just moving the SEAM-code to the other Phase does not work, because the
restoreAnyConversationContext(event); method accesses the component tree.

When is the conversationID stored in the request-params and when attached to the UIViewRoot?

[jameswoodward]

I've found a way around this.

In my CONVERSATION scoped component I inject an EVENT scoped component, which handles the binding.

So my conversation component looks something like:

@Stateful
@Name("cart")
@Interceptors(SeamInterceptor.class)
public class ShoppingCartBean implements ShoppingCart, Serializable {
...
 @In(value="cartTable", create=true)
 private transient TableBinding table;
...
}

And my event component looks something like:

@Name("cartTable")
@Scope(ScopeType.EVENT)
public class ShoppingCartTableBinding extends TableBinding {
}

Just for completeness, my TableBinding class is used to bind to a ADF Faces Table component:

public abstract class TableBinding {

 private UIXTable table;

 public UIXTable getBinding() {
 return table;
 }

 public void setBinding(UIXTable table) {
 this.table = table;
 }

 public List getSelectedRows() {
 List selectedRows = new ArrayList();

 Object oldKey = table.getRowKey();
 Set<String> selectedKeys = table.getSelectionState().getKeySet();

 for (String rowKey : selectedKeys) {
 table.setRowKey(rowKey);
 selectedRows.add(table.getRowData());
 }

 table.setRowKey(oldKey);

 return selectedRows;
 }

 public void clearSelection() {
 table.getSelectionState().clear();
 }
}

And my JSF page looks something like:

...
 <af:table binding="#{cartTable.binding}" ...>
...

[gavin.king]

The Conversation context is not available during the restore view phase. Hence the problem ;)

[scraatz]

Gavin,

is this by design or will it be fixed in later versions?

[gavin.king]

it is unavoidable