4 Replies Latest reply on Nov 14, 2005 8:43 AM by udo.krass

Conversation - how to start automatically with a given page

issad Sep 29, 2005 9:42 AM

I have a Staful Session Bean with a method that starts a conversation
scope:

@Begin
public String find() {
 report = null;
 String searchQuery = "from Report";
 reports = reportsDatabase.createQuery(searchQuery).getResultList();
 return "main";
}

I can now start a conversion from a view by calling this method
from an action attribute, for example:

<h:commandButton action="#{reportslist.find}" value="#{bundle.newreport}" />

But I need to start the conversion scope always automatically when
this page loads (not after pressing a button).

Can anybody help me, please?
Thanks a lot.

1. Additionally info: Conversation - how to start automatically

issad Sep 29, 2005 2:15 PM (in response to issad)

For addition a source code from Stateful session bean and view page:

Stateful bean:

@Stateful
@Name("reportslist")
@Interceptor(SeamInterceptor.class)
@Conversational(ifNotBegunOutcome="main")
public class ReportsBO implements Reports, Serializable {

 @PersistenceContext(type=EXTENDED)
 private EntityManager reportsDatabase;

 @Out(required=false)
 private Report report;

 @DataModel
 private List<Report> reports;
 @DataModelSelectionIndex
 private int reportIndex;

 @Begin
 public String find() {
 report = null;
 String searchQuery = "from Report";
 reports = reportsDatabase.createQuery(searchQuery).getResultList();
 return "main";
 }

 public String editReport() {
 report = reports.get(reportIndex);
 return "edit_report";
 }

 public String newReport() {
 report = new Report();
 return "edit_report";
 }

 public String clearReports() {
 for (Report rep: reports) {
 reportsDatabase.remove(rep);
 }
 return "main";
 }

 @End
 public String confirmed() {
 if (report.getId()==0) reportsDatabase.persist(report);
 return "show_list";
 }

}

View:

<%@ page contentType="text/html;charset=windows-1250" %>

<%@ taglib uri="http://java.sun.com/jsf/html" prefix="h" %>
<%@ taglib uri="http://java.sun.com/jsf/core" prefix="f" %>

<HTML>
 <HEAD>
 <title>Report aplikace</title>
 </HEAD>
 <body bgcolor="white">
 <f:loadBundle basename="resources.Resources" var="bundle"/>
 <f:view>
 <h:form id="helloForm">
 <h:dataTable id="table"
 value="#{reports}"
 var="rep">

 <h:column>
 <f:facet name="header">
 <h:outputText value="#{bundle.name}"/>
 </f:facet>
 <h:outputText value="#{rep.name}"/>
 </h:column>
 <h:column>
 <h:outputText value="#{rep.id}"/>
 </h:column>
 <h:column>
 <h:commandButton action="#{reportslist.editReport}" value="Edit" />
 </h:column>
 </h:dataTable>
 <h:commandButton action="#{reportslist.newReport}" value="#{bundle.newreport}" />
 <h:commandButton action="#{reportslist.clearReports}" value="#{bundle.clear}" />
 </h:form>
 </f:view>
 </body>
</HTML>

And I simply need to start a new conversation scope always when this view loads (= start "find" method from the stateful bean always when this view loads).

2. Re: Conversation - how to start automatically with a given p

lavoir Sep 29, 2005 2:50 PM (in response to issad)

My *guess* is you want to try looking into @Create
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3. Re: Conversation - how to start automatically with a given p

gavin.king Sep 29, 2005 7:23 PM (in response to issad)

Hmmmmmm, I have never tried to do this. Perhaps you could use @Intercept(ALWAYS), and add a method marked @Create @Begin to the bean. This should work, I guess...
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4. Re: Conversation - how to start automatically with a given p

udo.krass Nov 14, 2005 8:43 AM (in response to issad)

Hi issad,

will this work for you?
If yes, can you post your code?
Thanks.

Regards,

Udo
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