public static ConcreteAtualizarWidgets getInstance(){
       
       if(atualizarWidgets == null){
           try {
               atualizarWidgets = new ConcreteAtualizarWidgets();
           } catch (RemoteException ex) {
               Logger.getLogger(ConcreteAtualizarWidgets.class.getName()).log(Level.SEVERE, null, ex);
           }
       }
       return atualizarWidgets;
   }