Keycloak Client Creation

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.json.JSONException;
import org.json.JSONObject;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.keycloak.representations.idm.ClientRepresentation;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.test.context.junit4.SpringRunner;
import org.springframework.web.client.RestTemplate;

import java.util.ArrayList;
import java.util.Base64;
import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
public class ClientCreationTests {


	String realm = "demo";
	String baseUrl = "http://127.0.0.1:8080";

	String reg_clientId = "tpp-registration-client";
	String reg_clientSecret = "ee01f93a-5dcc-451d-bba3-25ef2a996245";

	String new_client_name = "Liffey Inc";
	String new_client_id = "liffey-inc";
	String new_client_redirecturl= "http://liffey.com/tpp";


	private Log log = LogFactory.getLog(ClientCreationTests.class);

	@Test
	public void createClient()  {

		String accessToken = getToken();
		log.info("Access Token : "+accessToken);


		ClientRepresentation client = new ClientRepresentation();
		List redirect_uris = new ArrayList();
		redirect_uris.add(new_client_redirecturl);

		client.setRedirectUris(redirect_uris);
		client.setName(new_client_name);
		client.setClientId(new_client_id);
		client.setDirectAccessGrantsEnabled(true);
		client.setServiceAccountsEnabled(true);
		client.setStandardFlowEnabled(false);

		String uri = baseUrl+"/auth/realms/"+realm+"/clients-registrations/default";
		log.info("Client Reg URL : "+uri);


		HttpHeaders headers = new HttpHeaders();
		headers.add("Authorization", "Bearer "+accessToken);
		headers.add("Content-Type", "application/json");

		ObjectMapper om = new ObjectMapper();
		String clientreqjson = null;
		try {
			clientreqjson = om.writeValueAsString(client);
			log.info("Client Creation request json : "+clientreqjson);
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}

		HttpEntity<String> request = new HttpEntity<>(clientreqjson, headers);

		RestTemplate restTemplate = new RestTemplate();

		ResponseEntity<String> exchange =
				restTemplate.exchange(
						uri,
						HttpMethod.POST,
						request,
						String.class);

		String response = exchange.getBody();
		log.info("Response : "+response);

		String secret = null;
		try {
			JSONObject obj = new JSONObject(response);
			secret = obj.getString("secret");
		} catch (JSONException e) {
			e.printStackTrace();
		}

		log.info("Client Secret : "+secret);

	}

	public String getToken ()  {

		RestTemplate restTemplate = new RestTemplate();

		log.info("new token");

		String uri = baseUrl+"/auth/realms/"+realm+"/protocol/openid-connect/token";
		log.info("Token URL : "+uri);

		String post_body = "grant_type=client_credentials&client_id="+reg_clientId+"&client_secret="+reg_clientSecret;
		log.info("Post body : "+post_body);

		HttpHeaders headers = new HttpHeaders();
		headers.add("Content-Type", "application/x-www-form-urlencoded");


		HttpEntity<String> request = new HttpEntity<>(post_body, headers);

		ResponseEntity<String> exchange =
				restTemplate.exchange(
						uri,
						HttpMethod.POST,
						request,
						String.class);

		String response = exchange.getBody();
		log.info("Token Response  : "+response);


		String accessToken = null;
		try {
			JSONObject obj = new JSONObject(response);
			accessToken = obj.getString("access_token");
		} catch (JSONException e) {
			e.printStackTrace();
		}

		log.info("Access Token : "+accessToken);

		return accessToken;
	}
}

requires the following keycloak maven dependencies :

	<!-- https://mvnrepository.com/artifact/org.keycloak/keycloak-core -->
	<dependency>
		<groupId>org.keycloak</groupId>
		<artifactId>keycloak-core</artifactId>
		<version>3.4.3.Final</version>
	</dependency>
	<!-- https://mvnrepository.com/artifact/org.keycloak/keycloak-client-registration-api -->
	<dependency>
		<groupId>org.keycloak</groupId>
		<artifactId>keycloak-client-registration-api</artifactId>
		<version>3.4.3.Final</version>
	</dependency>