IllegalArgumentException using selectManyCheckbox

Hello
I am have problems using selectManyCheckbox in my JSPs. I can get the checkboxes to be displayed correctly, and set correctly with values from the database.
But if I try to navigate off the page, or save the page when there are values set in the checkboxes, I get an IllegalArgumentException thrown in the validation.
The JSP looks like this:
<h:selectManyCheckbox value="#{role.selectedPrivileges}" layout="pageDirection">
<f:selectItems value="#{role.privileges}" />
</h:selectManyCheckbox>The backing bean has these in it:
private SelectItem[] privileges;
private String[] selectedPrivileges;...with the usual getters and setters.
The privileges array of SelectItem objects is initially set up in an action with this:
public SelectItem[] getPrivilegesAsSelectItems()
List<Privilege> privileges = cache.getPrivileges();
SelectItem[] result = null;
if (privileges != null)
    int n = privileges.size();
    if (n > 0)
      result = new SelectItem[n];
      for (int i = 0; i < n; i++)
        Privilege each = privileges.get(i);
        result[i] = new SelectItem(each.getId().toString(), each.getName());
return result;
}...and the selectedPrivileges String array is set like this:
List<RolePrivilegeLink> rvls = roleProfile.getRolePrivilegeLinks();
String[] values = new String[rvls.size()];
int i = 0;
for (RolePrivilegeLink each: rvls)
values[i] = each.getPrivilegeId().toString();
roleBean.setSelectedPrivileges(values);Sorry if this seems a bit boring, but I'm including this stuff because it shows I am using Strings as the values; I read somewhere that selectManyCheckbox tags only work with string values.
The error stack I get in the browser is:
500 Internal Server Error
java.lang.IllegalArgumentException
at javax.faces.component.SelectItemsIterator.next(SelectItemsIterator.java:166)
at javax.faces.component.UISelectMany.matchValue(UISelectMany.java:421)
at javax.faces.component.UISelectMany.validateValue(UISelectMany.java:390)
at javax.faces.component.UIInput.validate(UIInput.java:665)
at javax.faces.component.UIInput.executeValidate(UIInput.java:869)
at javax.faces.component.UIInput.processValidators(UIInput.java:432)
at javax.faces.component.UIForm.processValidators(UIForm.java:190)
at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:932)
at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:362)
at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:98)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:245)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:110)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:213)
...I would be grateful for any help, or if anyone knows of a good online tutorial about selectManyCheckbox tags.
Thanks very much
Matt West.

Hi
The privileges array ("roleBean" backing bean "privileges" property) is set in an action by calling the getSelectedPrivilegesAsSelectItems method.
roleBean.setPrivileges(cacheBean.getPrivilegesAsSelectItems());Thanks BalusC.
Matt.

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http://www.devshed.com/
http://www.javaranch.com/
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