CyclesController

    public Executor executor;

    static  {
        executor = Executors.newCachedThreadPool(new ThreadFactory() {
            public Thread newThread(@NotNull Runnable r) {
                Thread t = new Thread(r);
                t.setDaemon(true);
                return t;
            }
        });
    }

    public void initialize(URL location, ResourceBundle resources) {

        loadCyclesToTableView();
    }

    public void loadCyclesToTableView()    {

        final Task<HashMap<String, Cycle>> cyclesGetterTask = new Task<HashMap<String, Cycle>>() {
            @Override
            protected HashMap<String, Cycle> call() throws Exception {

                return Main.dbOperations.getChildren(DbOperations.CYCLES, Ref.class, Cycle.class);
            }
        };
        cyclesGetterTask.setOnSucceeded(new EventHandler<WorkerStateEvent>() {
            public void handle(WorkerStateEvent event) {

                String[] attributs = {"designation", "nbEtudiants"};
                HashMap<String, Cycle> cyclesHashMap = cyclesGetterTask.getValue();
                GUIutils.loadChildrenToTableView(cyclesTableView, cyclesHashMap, attributs);
            }
        });

        executor.execute(cyclesGetterTask);
    }