retrive value from collection and show in datatable - jsf-2

Question

I want to show language in view_lang.xhtml using datatable,Below are my classes
CountryBean.java
private ArrayList<Country> existingCountryList;
public ArrayList<Country> getExistingCountryList() {
System.out.println("CountryBean.getExistingCountryList::Enter");
existingCountryList = new ArrayList<Country>();
existingCountryList.addAll(getCountryService().getExistingCountry());
System.out.println("existingCountryList in countryBean"+existingCountryList);
System.out.println("CountryBean.getExistingCountryList:::Exit");
return existingCountryList;
}
country.java
private Set<CountryLanguage> countryLanguage = new HashSet<CountryLanguage>(0);
CountryLanguage.java
private CountryLanguageID countryLangPK = new CountryLanguageID();
CountryLanguageID.java
private Country country;
private Language language;
view_lang.xhtml
<h:dataTable id="existingCountry" var="countryLang" value="#{countryBean.existingCountryList}"
style="width: 100%" cellpadding="0" cellspacing="1" border="0" class="role_detail_section" rowClasses="activity_white, activity_blue">
<h:column>
<f:facet name="header">
<h:outputText value="Language(Code)" styleClass="heading_pm_det_white"/>
</f:facet>
<h:outputText value="#{countryLang.languageName}(#{countryLang.languageCode})" styleClass="heading_pm_det_white" />
</h:column>
</h:dataTable>
I am able to get country object with language but not able to print in datatabel.
what will be syntex do I have to use forEach, if yes then how.
thnx

Answer 1

You can use <ui:repeat> for this, but this doesn't support Set (because it's not ordered by an index). You need to convert it to a List or an array. If you're using EL 2.2, then you could use the Set#toArray() call directly in EL:
<ui:repeat value="#{countryLang.countryLanguage.toArray()}" var="countryLanguage">
...
</ui:repeat>
Update, as per the comments, you'd like ot print it comma separated, here's how you could do it:
<ui:repeat value="#{countryLanguage.language.languageName}" var="languageName" varStatus="loop">
#{languageName}#{loop.last ? '' : ', '}
</ui:repeat>
Note: if languageName is actually a Set instead of List, obviously use toArray() there.