Hello,

I am relatively new with JBoss technologies; I spent a lot of time reading books and posts but I spent several days on a very simple thing; others people have already explain the same problem on the forum but the proposed solutions are not working for me.

My post is quite long cause I prefer giving you a complete presentation of my problem.

I'am using

jBoss Seam 2.0.0.CR2
with jboss-4.2.1.GA

I will take a simple example :

I have:

- a continent entity
- a country entity

Of course, continent contains serveral countries and a country is attached to a continent :

@Entity
@Name("continent")
@Table(name = "Continents")
public class Continent extends PersistentEntity implements Serializable {

 private static final long serialVersionUID = 1L;
 private long id;
 private Set<Country> countries;
 private String name;

 public Continent() { }

 public Continent(String name) {
 this.name = name;
 }

 @Id
 @GeneratedValue
 public long getId() {
 return id;
 }

 public void setId(long id) {
 this.id = id;
 }

 public String getName() {
 return name;
 }

 public void setName(String name) {
 this.name = name;
 }

 @OneToMany
 public Set<Country> getCountries() {
 return countries;
 }

 public void setCountries(Set<Country> countries) {
 this.countries = countries;
 }

@Entity
@Name("country")
@Table(name="Countries")
public class Country extends Location implements Serializable {

 private static final long serialVersionUID = 1L;
 private long id;
 private Continent continent;
 private Set<Region> regions;

 @Id
 @GeneratedValue
 public long getId() {
 return id;
 }

 public void setId(long id) {
 this.id = id;
 }

 @OneToMany
 public Set<Region> getRegions() {
 return regions;
 }

 public void setRegions(Set<Region> regions) {
 this.regions = regions;
 }

 @ManyToOne
 public Continent getContinent() {
 return continent;
 }

 public void setContinent(Continent continent) {
 this.continent = continent;
 }

Now I have a XHTML page with <h:selectOneMenu items.

The first list all the continents, and on the selection of a continent, I would like to enable the country select box and refreshing it with the countries located in the selected continent.

I read a lot of documents but I can't manage to get a response on value selection.

I have the xHTML form :

<h:form id="creationForm">
 <h:outputText value="Continent: " />
 <h:outputText value="No continent"
 rendered="#{creationAction.getNumberOfPossibleContinents()==0}" />

 <h:selectOneMenu value="#{creationAction.selectedContinent}"
 valueChangeListener="#{creationAction.continentChangeEvent}"
 onchange="this.form.submit()"
 rendered="#{creationAction.getNumberOfPossibleContinents()>0}">

 <s:selectItems
 value="#{creationAction.getPossibleContinentsList()}"
 var="selectedContinent" noSelectionLabel="Please Select..." />
 <s:convertEntity />
 </h:selectOneMenu>
 </h:form>

creationAction is defines like this

@Stateful
@Name("creationAction")
@Scope(ScopeType.SESSION)
public class creationAction implements ICreation {

 private Continent selectedContinent;
 private List<Continent> possibleContinentsList;

 @PersistenceContext(type = EXTENDED)
 private EntityManager entityManager;

 public void cancelCreation() {
 }

 @Remove
 @End
 public void confirmCreation() {
 System.out.println("CONFIRM");
 }

 @SuppressWarnings("unchecked")
 public List<Continent> getPossibleContinentsList() {
 possibleContinentsList = entityManager
 .createQuery("from Continent row").getResultList();

 return possibleContinentsList;
 }

 public void addContinent(Continent continent) {
 }

 public Continent getSelectedContinent() {
 return null;
 }

 public void setSelectedContinent(Continent continent) {
 System.out.println("Set...");
 }

 public int getNumberOfPossibleContinents() {
 int result = 0;

 if (possibleContinentsList != null) {
 result = possibleContinentsList.size();
 } else {
 result = getPossibleContinentsList().size();
 }

 return result;
 }

 public void continentChangeEvent(ValueChangeEvent event) {
 System.out.println("Event : " + event);
 System.out.println("New value : " + event.getNewValue());
 }

With the interface :

@Local
public interface ICreation {

 public void confirmCreation();

 public void cancelCreation();

 public List<Continent> getPossibleContinentsList();

 public void addContinent(Continent continent);

 public Continent getSelectedContinent();

 public void setSelectedContinent(Continent continent);

 public int getNumberOfPossibleContinents();

 public void continentChangeEvent(ValueChangeEvent event);

The continent list is displayed but continentChangeEvent method is never called !

In the debug console (when I select a continent ...) :

13:52:22,098 INFO [lifecycle] WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.
sourceId=creationForm:j_id19[severity=(ERROR 2), summary=(value is not valid), detail=(value is not valid)]

Any ideas ?

I'am of course free for answer to all your questions ?

Thanks for your help !