how to validate empty selectonemenu ?

[grdzeli_kaci]

hi all,
i have simple question.
i have one selectonemenu and rich message for it, also i have selectonemenu validation.
validation works if i have elements into selectonemenu, but it is emptyu validation does not work.
code snippets:
1.view :

 <h:selectOneMenu id="dbDriverid" styleClass="LoginLangCombo" value="#{dbparams.dbDriver}">
 <s:selectItems value="#{dbDrivers.resultList}" var="driver" label="#{driver.dbDriverName}"/>
 <s:convertEntity />
 <f:validator validatorId="SelectValidator"/>
 </h:selectOneMenu>
 <rich:message for="dbDriverid"
 ajaxRendered="true"
 tooltip="true"
 showDetail="false"
 showSummary="true"
 passedLabel="No Error"
 errorLabelClass="errorLabel"
 fatalLabelClass="warnLabel"
 infoLabelClass="infoLabel"
 warnLabelClass="fatalLabel"
 title="this is tooltip">
 <f:facet name="errorMarker">
 <h:graphicImage url="/img/error.gif"/>
 </f:facet>
 <f:facet name="fatalMarker">
 <h:graphicImage url="/img/fatal.gif"/>
 </f:facet>
 <f:facet name="infoMarker">
 <h:graphicImage url="/img/info.gif"/>
 </f:facet>
 <f:facet name="warnMarker">
 <h:graphicImage url="/img/warn.gif"/>
 </f:facet>
 <f:facet name="passedMarker">
 <h:graphicImage url="/img/passed.gif"/>
 </f:facet>
 </rich:message>

2. validator :

public class SelectValidator implements Validator {

 public SelectValidator() {
 }

 public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
 System.out.println("SelectValidator.validate()");

 DbDriver dbDriver = (DbDriver) value;
 String clientId = component.getClientId(context);
 int componentNum = componentNum(component.getId());
 System.out.println("selectedValue = " + dbDriver);
 System.out.println("clientId = " + clientId);
 System.out.println("componentNum = " + componentNum);

 if (dbDriver == null) {
 FacesMessage message = new FacesMessage();
 message.setSummary("warning SUMMARY for: " + componentNum + " input");
 message.setDetail("warning DETAIL for: " + componentNum + " input");
 message.setSeverity(FacesMessage.SEVERITY_WARN);
 context.addMessage(clientId, message);
 }
 }

 public int componentNum(String baseId) {

 if (baseId.endsWith("1")) {
 return 1;
 } else if (baseId.endsWith("2")) {
 return 2;
 } else if (baseId.endsWith("3")) {
 return 3;
 } else if (baseId.endsWith("4")) {
 return 4;
 }

 return -1;
 }

any ideas ?
any idea will be appreciated.


_____________________
Regards.
Paata Lominadze
Magticom LTD.