SvcServiceA.java

@Autowired
TokenString tokenString; 

public String callB() {
    RestTemplate restTemplate = new RestTemplate();
    HttpHeaders headers = new HttpHeaders();
    headers.set("Authorization", "bearer " + tokenString.getValue());

    HttpEntity entity = new HttpEntity(headers);

    ResponseEntity re = restTemplate.exchange(<SERVICE_B_ADDRESS>, HttpMethod.GET, entity, String.class);
    return re.getStatusCode().equals(HttpStatus.OK) ? "ok" : "not ok";
}