private ListenableFuture<ResponseEntity<classDtoR>> entity;

@GetMapping("/begin")
public void getValor() {
        AsyncRestTemplate  restTemplate = new AsyncRestTemplate ();
        entity  = restTemplate.getForEntity("http://localhost:8080/example/begin"
                ,classDtoR.class);
}

@GetMapping("/state")
public boolean getValor1() {
    try {
        return entity.isDone();
    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}

@GetMapping("/result")
public ResponseEntity<ConciliacionBancoDtoR> getValor2() {
    try {
        return entity.get();

    } catch (Exception e) {
        throw new RuntimeException(e);
    }
}