How I Decoupled Circuit Breaker from the Code with AOP in Spring Boot for Better Code Maintenance

DownstreamService.java

//code is omitted for brevity

@Service
public class DownstreamService {

  //code is omitted for brevity

  /**
   * Response from this API call will not have a delay
   *
   * @return the json object
   */
  @EnableCircuitBreakerScan
  public JSONObject callTest() {
    JSONObject result;

    try {

      String serviceUrl = "http://localhost:3000/test";
      RestTemplate restTemplate = new RestTemplate();
      result = restTemplate.getForObject(serviceUrl, JSONObject.class);

    } catch (HttpClientErrorException ex) {
      throw new RuntimeException("external API error");
    } catch (Exception ex) {
      throw new RuntimeException("server error");
    }

    JSONObject payloadJSONObject = new JSONObject();
    payloadJSONObject.putAll(result);
    return payloadJSONObject;
  }

  /**
   * Response from this API call will have over 2 seconds of a delay
   *
   * @return the json object
   */
  @EnableCircuitBreakerScan
  public JSONObject callTestSlow() {
    //code is omitted for brevity
  }

  /**
   * Response from this API call will have an error
   *
   * @return the json object
   */
  @EnableCircuitBreakerScan
  public JSONObject callTestError() {
    //code is omitted for brevity
  }

}