Natural conversations: the <conversation> parameter-value attribute

[kipod]

Hello all,

I have a list of products in productList.xhtml, when the user clicks one of them he is takes to that product's productDetails.xhtml page using a page parameter, and a nested long-running conversation is started.

I would like that page parameter to act as a natural conversation token, so that if the user opens the same product twice (let's assume once by opening the product's link in a new tab, and once by simply left-clicking the product link) - only a single conversation is started, and the second click resumes it rather than starting a new one.

I am definitely misunderstanding something about the designers' intentions in respect to the <conversation> tag's 'parameter-value' attribute.

pages.xml :

<conversation name="Product"
           parameter-name="productId"
           parameter-value="#{productHome.instance.id}"/>
     
<page view-id="/productDetails.xhtml" conversation="Product">
     <description>
          Product details
     </description>
     
         <begin-conversation join="true" flush-mode="manual"/>
     <param name="productId" value="#{productHome.id}"
               converterId="javax.faces.Long" />
</page>

When is does the EL

parameter-value="#{productHome.instance.id}"

evaluate?
Because I am getting an exception saying the EL produces null, when displaying productList.xhtml:

SEVERE [viewhandler] Error Rendering View[/productList.xhtml]
java.lang.IllegalStateException: conversation id evaluated to null: Product

in the productList.xhtml page I have (under a rich:dataTable with var="_prd") :

<s:link id="productName"
     value="#{_prd.name}"
     view="/productDetails.xhtml"
     propagation="nest"
     conversationName="Product">
     <f:param name="productId" value="#{_prd.id}"/>
</s:link>

Does Seam evaluate parameter-value="#{productHome.instance.id}" when rendering productList.xhtml ???

My general intention for Seam here is:

Redirect to the productDetails.xhtml page with the productId parameter set to this row's product id, If this Product entity already has an existing conversation - resume it, don't start a new one.

What am I doing wrong, how is this done?

Thanks!

[kipod]

Maybe I can narrow my question a bit:

1. Does Seam evaluate the <conversation>'s parameter-value="#{productHome.instance.id}" upon rendering the mentioned s:link ?

2. If so - What should this attribute be? When rendering the productList.xhtml and the s:link the productHome context variable does not yet exist.

Any advice would be great, thanks.

[kipod]

Any thoughts?

How should a natural conversation's parameter-value attribute be defined, if we have a data table, whose rows each link to a page that participates in the conversation?

[kipod]

Welp... I still havn't been able to overcome the issue:

How do I resume an ongoing nested natural conversation, instead of starting a new one???
The conversation's parameter-value attribute I'm using ("#{productHome.instance.id}")
is YET to be created when the link that links to the natural conversation page is rendered...

(If anyone has an idea - please help)

[cinconnu]

I have the exact same problem... has anyone an idea about this issue ?
Thanks