Hi Damar,
It seems like somehow #{choice.groups} resolves to null.
I don't really know why, but you can try to debug your app and look at the
value of groups. Either some part of your code sets groups to null or it is
not initialised at all.
In your case, I would write Choice.java in the following way:
public class Choice {
private List<SelectItem> groups;
public Choice() {
}
public List<SelectItem> getGroups() {
if (groups == null)
{
groups = new ArrayList<SelectItem>();
groups.add(new SelectItem(1,"Test"));
groups.add(new SelectItem(2,"Test1"));
}
return groups;
}
public void setGroups(List<SelectItem> groups) {
this.groups = groups;
}
}
Regards,
Jakob
2010/1/2 Damar Thapa <[email protected]>
> Hi,
>
> I am trying to create a selctOneMenum, and I have the following snapshot of
> xhmtl file:
>
> <t:selectOneMenu value="#{libraryUser.group}">
> <f:selectItems value="#{choice.groups}"/>
> </t:selectOneMenu>
>
> Choice.java (choice.groups) is as follows:
>
> public class Choice {
> private List<SelectItem> groups=new ArrayList<SelectItem>();
>
> public Choice() {
> groups.add(new SelectItem(1,"Test"));
> groups.add(new SelectItem(2,"Test1"));
> }
>
> public List<SelectItem> getGroups() {
> return groups;
> }
>
> public void setGroups(List<SelectItem> groups) {
> this.groups = groups;
> }
>
> }
>
> I, however, is getting error message:
>
> Caused by: java.lang.IllegalArgumentException: Value binding
> '#{choice.groups}'of UISelectItems with component-path {Component-Path :
> [Class: javax.faces.component.UIViewRoot,ViewId:
> /pages/userInput.xhtml][Class: javax.faces.component.html.HtmlForm,Id:
> helloForm][Class: javax.faces.component.html.HtmlPanelGrid,Id:
> j_id8][Class:
> org.apache.myfaces.component.html.ext.HtmlSelectOneMenu,Id: j_id19][Class:
> javax.faces.component.UISelectItems,Id: j_id20]} does not reference an
> Object of type SelectItem, SelectItem[], Collection or Map but of type :
> null
> at
>
> org.apache.myfaces.shared_tomahawk.util.SelectItemsIterator.hasNext(SelectItemsIterator.java:166)
>
> From the error message, it sounds like groups does not have SelectItem
> object, and I am missing something. I appreciate if somebody can provide me
> some pointers.
> Thanks,
> With regards,
> Damar
>
