Error with Seam converations

[vaidyaranju]

Hello,

      I am new to Seam and currently working on an application using Seam 2.1.2 deployed on JBoss 4.2.2 . I am trying to implement a flow where the first page  shows the list of available templates. Clicking on any of the available templates takes the user to the edit screen with update option. I have tried to implement this using Seam conversation with a POJO Action Handler.
Here is the code snip of the action

@Name("templateAction")
@Restrict("#{s:hasRole('Admin')}")
@Scope(ScopeType.CONVERSATION)
public class TemplateAction implements Serializable
{
     /**
      * 
      */
     private static final long serialVersionUID = 1L;


     @Create
     public void init() {
          getLanguages();
     }
     
     @Logger private Log log;


     @In
     Users user;
     
     @In("#{commonService}")
     CommonServicesImpl commonServiceImpl;
     
     @DataModel
     private List<Template> templateList = null;

     @DataModelSelection
     Template templateSelection;
     
     
     Template templateObject;
     
     
     public Template getTemplateObject() {
          return templateObject;
     }

     public void setTemplateObject(Template templateObject) {
          this.templateObject = templateObject;
     }
     

     @Factory(value = "templateList")
     @Begin(join=true)
      public void getTemplates()
     {

          log.info("TemplateAction.getTemplates action called ");
          try {

           templateList = commonServiceImpl.getTemplateList();

               log.info("Searchlist Size :" + templateList.size());

          } catch (ServiceException exception) {
               log.error(exception);
          }

     }

    public String editTemplate()
    {
     log.info("templateAction.editTemplate action called");
     templateObject = templateSelection;
     return "edit";
    }
     
       
    @End
    public String updateTemplate()
    {
         log.info("templateAction.updateTemplate action called");
         
        return "success";
    }

}

The conversation begins with the search and ends with update or cancel.

Here is the snip of  edit xhtml

<h:panelGrid id="editPanel" columns="2" rowClasses="prop" rendered="#{!empty templateAction.templateObject.id}" style="width : 600px;">
                         
                         <h:outputLabel for="template" styleClass="label">
                              <h:outputText id="templateText"
                                   value="#{messages['template.template']}" />
                         </h:outputLabel>
                         <s:decorate>
                              <f:facet name="afterInvalidField">
                                   <s:message styleClass="requiredMsg" />
                              </f:facet>
                              <h:inputText id="templateValue" required="true"
                                   value="#{templateAction.templateObject.name}" styleClass="text" />
                         </s:decorate>

                         <h:outputLabel for="headerURL" styleClass="label">
                              <h:outputText id="headerURLText"
                                   value="#{messages['template.headerurl']}" />
                         </h:outputLabel>
                         <s:decorate>
                              <f:facet name="afterInvalidField">
                                   <s:message styleClass="requiredMsg" />
                              </f:facet>
                              <h:inputText id="headerURLValue" required="true"
                                   value="#{templateAction.templateObject.headUrl}" styleClass="text" />
                         </s:decorate>               

                         <f:facet name="footer">
                              <h:panelGroup style="display:block; text-align:right">
                                   <rich:separator />
                                   <h:commandButton id="templateEdit" styleClass="actionbutton"
                                        value="Update Template" action="#{templateAction.updateTemplate}">
                                   </h:commandButton>
                              </h:panelGroup>
                         </f:facet>

                    </h:panelGrid>

Everything works fine till the edit page, however when I click update, throws the error

14:21:54,040 WARN  [lifecycle] /pages/editTemplate.xhtml @42,74 value="#{templateAction.templateObject.id}": Target Unreachable, 'templateObject' returned null on 'TemplateAction_$$_javassist_seam_3'
javax.el.PropertyNotFoundException: /pages/editTemplate.xhtml @42,74 value="#{templateAction.templateObject.id}": Target Unreachable, 'templateObject' returned null on 'TemplateAction_$$_javassist_seam_3'

and shows the same page with all values blank.

With some debugging what I find is that another instance of the templateAction is created when I click Update and then destroyed , even though the first (original)instance is still available in the conversation context.

14:21:24,650 INFO  [TemplateAction] ******TemplateAction Created******:TemplateAction@4b9e08
14:21:24,650 INFO  [TemplateAction] TemplateAction.getTemplates action called - Search called
14:21:24,682 INFO  [TemplateAction] Searchlist Size :1
14:21:24,682 INFO  [TemplateAction] CONVERSATION Started
14:21:24,682 INFO  [TemplateAction] id: 7; isLongRunning true; viewId: /pages/template.xhtml
14:21:31,556 INFO  [TemplateAction] templateAction.editTemplate action called -  Edit page
14:21:53,993 INFO  [TemplateAction] ******TemplateAction Created******:TemplateAction@15f7447 - when "Update" is clicked

14:21:54,040 WARN  [lifecycle] /pages/editTemplate.xhtml @42,74 value="#{templateAction.templateObject.id}": Target Unreachable, 'templateObject' returned null on 'TemplateAction_$$_javassist_seam_3'
javax.el.PropertyNotFoundException: /pages/editTemplate.xhtml @42,74 value="#{templateAction.templateObject.id}": Target Unreachable, 'templateObject' returned null on 'TemplateAction_$$_javassist_seam_3'
 
14:21:54,040 ERROR [lifecycle] JSF1054: (Phase ID: PROCESS_VALIDATIONS 3, View ID: /pages/editTemplate.xhtml) Exception thrown during phase execution: javax.faces.event.PhaseEvent[source=com.sun.faces.lifecycle.LifecycleImpl@18925c9]
14:21:54,072 INFO  [TemplateAction] ******TemplateAction Destroyed******:TemplateAction@15f7447

Any ideas why this is happening ? Is this the reason for the error or is it something else that I am missing ?

Any help will be greatly appreciated.

-Thanks

[chris.simons]

My guess would be that your not injecting/outjecting your templateSelection object.  Therefore it's not available on the following (edit) page.

You could also pass templateSelection into the editTemplate() method.

Also, I believe you would want to nest the conversation on edit, but that's just me.

[vaidyaranju]

I tried bijecting the templateSelection and bijecting the templateObject. 

Anyway the selection values are available on the edit page following the selection. It's when I click the update on the edit page that the values are lost and the error's shown above occurs.