<h:selectOneListbox value="#{addDepartmentForm.country}" size="1" id="country">
<f:selectItem itemValue="-1" itemLabel=""/>
<s:selectItems value="#{countries.allCountries_Dropdown}" var="c" label="#{c.name}"/>
<s:convertEntity/>
</h:selectOneListbox>@Name("addDepartmentForm")
@Scope(ScopeType.EVENT)
public class AddDepartmentForm implements Serializable {
private Country country;
// ... getters & setters
}@Name("countries")
@Scope(ScopeType.PAGE)
public class Countries implements Serializable {
@In private EntityManager entityManager;
public List<Country> getAllCountries_Dropdown() {
return entityManager.createQuery("select c from Country c").getResultList();
}
}@Entity
@Table(name="COUNTRIES")
public class Country {
@Id
@Column(name="COUNTRY_ID")
private String id;
@Column(name="COUNTRY_NAME")
private String name;
// ... getters & setters
}If you look at the code, you'll see that I want to have a drop-down list of countries with a blank item on the top (so I need f:selectItem).The entity Country has a string id. But if I have a string value (which cannot be converted to a number) for the itemValue of the f:selectItem, I get a NumberFormatException for that non-number itemValue. Right now, I have to put a number there (which doesn't make sense, but doesn't cause exceptions).
What's the right way to add a blank item on the top of the drop-down list like mine?
Thank you.
