How to delegate Notification message from client class to server class??

I am using server RPC  for this delegation but nothing is fired.

step 1 : create server rpc .
      public interface UploadServerRpc extends ServerRpc{
                   public void clicked(String buttonName);
}
step 2 : create connector class 
   @Connect(UploadComponent.class)
public class UploadComponentConnector extends UploadConnector {
    UploadServerRpc rpc = RpcProxy.create(UploadServerRpc.class, this);
        public UploadComponentConnector(){
               if(getWidget().isSubClick()) {
                 rpc.clicked(getWidget().getNotificationName());
                }
    }
}

step 3 : server side class:
public class UploadComponent extends Upload{
    private UploadServerRpc srpc = new UploadServerRpc(){
        @Override
        public void clicked(String name) {
            Notification notification = new Notification(name);
            UI.getCurrent().getPage().showNotification(notification);
        }
    };
    public UploadComponent() {    
        registerRpc(srpc);
    }
Note : inside VUpload class hanling some restriction itsworking but cannot delegate notification messsage 
Nothing happened ....when i clicked vaadin Upload button .

Hi,

Your code looks ok except for one thing: The only potential problem is calling rpc.clicked(...). I assume calling the event handler in the constructor like this is for testing purposes. Are you then sure that the method getWidget().isSubClick() returns true? In general to handle events from a button you need to register an event handler for it. Some tips for developing client-side code: 1) make sure your widgetset is re-compiled before testing 2) Enable superdevmode and use Chrome developer tools to debug the client-side Java code, see https://vaadin.com/book/-/page/clientside.debugging.html.

Best regards,
Pontus