@Test
    public void whenLoadApplication_thenSuccess() {
    	String accessToken = obtainAccessToken("7597133091274");
    	System.out.println("Access Token: "+accessToken);
    }

    private String obtainAccessToken(String clientId) {
		String username = "fheras.garcia@gmail.com";
		String password = "f@r1thjhg";
		String token_url = "http://localhost:9001/tw-auth-server/oauth/token";
		String secret = "33b17e044ee6a4fa383f46ec6e28ea1d";

		final Map<String, String> params = new HashMap<String, String>();
		params.put("grant_type", "password");
		params.put("client_id", clientId);
		params.put("username", username);
		params.put("password", password);

		final Response response = RestAssured.given().auth()
				.preemptive()
				.basic(clientId, secret)
				.and().with().params(params)
				.when().post(token_url);

		return response.jsonPath().getString("access_token");
	}