When i doing the portlet IPC with Events ,i can send and recevie the event,but the EventNavigationResult's Outcome return from the BridgeEventHander Class cannot cause a jsf page navigation,Why??can anyone tell me about that?thanks!

1. The Receive Bean:

public class EventReceivingBean implements BridgeEventHandler {

private static Logger log = Logger.getLogger("EventReceivingBean");

private EventNavigationResult envgr;

public EventNavigationResult handleEvent(FacesContext context, Event event) {

  SimpleBean sb = ((SimpleEvent)event.getValue()).getEchoBean();
 
  navigation naviga=(navigation) context.getExternalContext().getSessionMap().get("Navigation");
 
  naviga.setDeliveredBean(sb);
 
  envgr=new EventNavigationResult("add","add");
 
  log.info(" outcomes = " + envgr.getOutcome());
 
  return envgr;
 
}

2, IN portlet.xml:

   <init-param>
   <name>javax.portlet.faces.bridgeEventHandler</name>
   <value>lee.abc.EventReceivingBean</value>
  </init-param>