JSF Conversion error for h:selectManyListbox

Question

There's an exception (*Conversion error occurred*) from JSF on <h:selectManyListbox> component for id availableUsers which is bound to myBean*.*roleId
Now myBean*.*roleId is of Long datatype and so is the usersList*.*SelectItem*.*value. So, would not be any datatype mismatch. Tried using a converter too with no luck.
If you have come across any such issue, please do let me know, thanks!
Exception
javax.faces.model.SelectItem@1b115c1b]
[8/14/08 1:59:44:645 IST] 00000061 jsf E com.sun.faces.context.FacesContextImpl addMessage Adding Message[sourceId=emailmessage:*availableUsers* ,summary=*Conversion error occurred*.)
[8/14/08 1:59:44:661 IST] 00000061 jsf E com.sun.faces.context.FacesContextImpl addMessage Adding Message[sourceId=emailmessage:selectedUsers,summary=Conversion error occurred.)
JSF
<h:selectManyListbox id="*availableUsers* " value="#{myBean.roleId}" converter="javax.faces.Long"
binding="#{myBean.usersListBox}" size="5" style="width: 138px; height: 102px">
<f:selectItems id="usersItems" value="#{myBean.usersList}"
binding="#{myBean.usersListBoxSelectItems}" />
</h:selectManyListbox></td>
CLASS
*{code}*
*class MyBean*
*private Long roleId;*
*private List usersList;*
*{code}*
usersList is an arraylist of SelectItem where each SelectItem is composed of a Long value and a String label as per the convention.

Answer 1

I tried using a List<Long>, but getting another error now, any help would be greatly appreciated, thanks!
Error:
[8/15/08 0:11:32:692 IST] 0000007e jsf E com.sun.faces.context.FacesContextImpl addMessage Adding Message[sourceId=emailmessage:selectedUsers,summary=Validation Error: Value is not valid)
JSF Code:
h:selectManyListbox id="selectedUsers" binding="#{myBean.selectedUsersListBox}" value="#{myBean.recipientIdList}" size="5"
converter="#{myBean.recipientIdListConverter}" style="width: 138px; height: 102px">
<f:selectItems id="selectedUsersItem" value="#{myBean.recipientList}" binding="#{myBean.selectedUsersListBoxSelectItems}" />
</h:selectManyListbox>
backing Bean Code for class myBean:
{code}public List recipientList;
private ArrayList recipientIdList;
private HtmlSelectManyListbox selectedUsersListBox;
private UISelectItems selectedUsersListBoxSelectItems;
public Converter getRecipientIdListConverter() {
          return new Converter() {
               public Object getAsObject(FacesContext facesContext,
                         UIComponent component, String value)
                         throws ConverterException {
                    if (value == null)
                         return null;                                                       
                    for (Iterator i = recipientIdList.iterator(); i.hasNext();) {
                         Long item = (Long) i.next();
                         String val = String.valueOf(item);
                         if (val.equals(value)) {
                              return item;
                    return null;
               public String getAsString(FacesContext facesContext,
                         UIComponent component, Object object)
                         throws ConverterException {
                    if (object instanceof SelectItem) {                         
                         return ((SelectItem) object).getValue().toString();
                    } else if (object instanceof Long) {
                         return String.valueOf(object);
                    } else {
                         return object.toString();
     }{code}