Problem with selectOneMenu and Conversation

[baz]

Hello,

i do have a problem which i assume to be reported in the past. But i can not find any sign of it:-(
So here it goes again. If someone can give me a hint how to solve it or a pointer to the original problem it will be very helpful.

This is my page.xml (a conversation is started)

<page ...>

      

    <description>generateFieldplan</description>

    <begin-conversation join="true"/>

 [...]

</page>

This is the corresponding xhtml page with a selectOneMenu and three buttons.

<rich:panel>

     <f:facet name="header">

          <h:outputText value="Select Accessions" />

     </f:facet>

     <h:form>

          <h:selectOneMenu value="#{selectEvaluation.evaluation}" id="evalselect">

               <s:selectItems value="#{evaluationList}" var="eval"

                              label="#{eval.evaluationId}" noSelectionLabel="Please select..." />

               <s:convertEntity />

               <a4j:support action="#{selectEvaluation.selectEvaluation}" event="onchange"/>

                         

          </h:selectOneMenu>

          <s:button value="select Standards" view="/fieldplan/html/selectStandards"/>

          <s:button value="select Targets" view="/fieldplan/html/selectTargets"/>

          <h:commandButton value="Generate Fieldplan" action="#{selectAccession.generate}"/>

     </h:form>

</rich:panel>

Problem is:

when visiting the page the user can select from the menu and the selection is stored in the context. All subpages (calles with the button) are referencing the correct selected value.

But when returning from a subpage the selectOneMenu does not show the selected value and further more there is no list to choose from:-(

Here comes the backing bean:

@Name("selectEvaluation")

@Scope(ScopeType.CONVERSATION)

public class SelectEvaluationBacking {

     @Logger Log log;

     

     @Out(required=false)

     private Evaluation evaluation;


     @Out(required=false)

     private Evaluation selectedEvaluation;

     @In EvaluationQuery evaluationQuery;

     

     @DataModel

     List<Evaluation> evaluationList;

     

     @Create

     public void initialize(){

          log.info("selectEvaluation created");

     }

     

     @Factory("evaluationList")

     public void initEvaluationList(){

          log.info("selectEvaluation created");

          evaluationList=evaluationQuery.getResultList();

     }

     public void selectEvaluation(){

          log.info("selectEvaluation: #0", evaluation);

          selectedEvaluation=evaluation;

     }

[getters and setters stripped of]

I suppose that this is not a seam problem. But perhaps someone can shed a little bit of light on this,(again?)

Ciao,

Carsten

[pmuir]

I guess it can't show the selected value as there is no list.

What version of Seam?

[baz]

This is a reply to the question Peter asks.
I am using Seam 2.0.0GA

The list and the selected values are there, at least in the backings (logging and debugging makes sure) but not on the pages.
BTW: when i try to reply to Peters posting i get an error. So i replied to my own posting.

[christian.bauer]

Carsten Höhne wrote on Feb 19, 2008 08:57 AM:

BTW: when i try to reply to Peters posting i get an error. So i replied to my own posting.

I just fixed this, it was only broken for about 10 minutes.

[baz]

Thanks Christian,
very fast reaction.
Ciao,
Carsten

[jcarlosandia]

In your code, make evaluationList a member of your class (add the private and respective getter and setters). Then in your page use

value="#{selectEvaluation.evaluationList}"

instead of

value="#{evaluationList}"

Hope that helps.

[baz]

Thanks for answering.
No this does not solve the problem. No matter how you access this list, the problem is the same.

[jcarlosandia]

It seems you are not initiating you conversation correctly. Try these methods in your bean:

@Begin(join=true)
@Create
public void init(){
   log.info("Initializing my bean");
}

and also:

@Remove
@Destroy
public void destroy(){
   log.info("Destroying my Bean");
}

And check if the destroy method is called.

[baz]

That does not solve it. I believe it is something of an incompatibility issue or a bug with the JSF implementation in JBoss AS 4.2.2GA.

For clarifying only:

From the Seam docu Chapter 3.4:

The @Destroy method is called when the context that the Seam component is bound to ends. Components may define only one @Destroy method.

And finally, there are more than one way to start a conversation.
See chapter 6 of Seam docu

[damnh.damnh.aureole-net.com.vn]

I had the same problem. I solved this problem by extending MenuRenderer and override method isSelected() to compare the old value with values of list data by entity's ID.
And this problem is solved.

[baz]

Thanks for the answer.
Am i right, that you say that this is an issue with the jsf implementation?

But why is the entire list not shown, when retrning from a subpage?