final Timer t=new Timer() {
                       int i=0;
                      @Override
                      public void run() {
                                greetingService.getDataHit(
                                                new AsyncCallback<Integer>() {
                                                        public void 
onFailure(Throwable caught) {
                                                                
hitLabel.setText(SERVER_ERROR);
                                                        }

                                                        public void 
onSuccess(Integer result) {

                                                                
hitLabel.setText(result+" and increasing ...");
                                                        }
                                                });
                                i++;
                                if(i>8){
                                        t.cancel();
                                }
                      }
                    };
                 t.scheduleRepeating(800);

If I understood truly this code may help to solve your problem. This
is getting an integer result from server 8 times in time interval 800
miliseconds...

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