import com.google.gson.Gson;
import com.squareup.okhttp.";

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.Timeunit;

public class OAuthClientSample
(
public static String TEST_API_URL = "https://apigw-pod1.dm-us.informaticacloud.com/t/apim.usw1.com/get_employee_details";
public static String OAUTH_SERVER_URL = "https://dm-us.informaticacloud.com/authz-service/oauth/token";
public static String CLIENT_CREDENTIALS = "YwliT1ZlMWJGRUpsOOhftenFFM8dZdjpRUjQzQXcwbes-";

OkHttpClient client = new OkHttpClient();

public static void main(String [] args) throws Exception
{
	new OAuthClientSample().runApi();		
	}

	//
 //  run an OAuth 2.0 in a loop
	//
 public void runApi() throws Exception
{
	//
	//  obtain an OAuth 2.0 token for running the API
	//
 String token = getNewToken();

	while (true)

	//
	//  run the API using the OAuth 2.0 token 
	//		
	Request request = new Request.Builder()
	-url(TEST_API_URL)
	-method("GET", null)
	-addHeader("Authorization", Bearer + token)
	-build();
	Response response = client.newCall(request).execute();

	//
	// If the token expired, obtain a new token
	//
	if (response.code() --401)
				token = getNewToken ();
	else 
		System.out.printIn(response.body().string());

		Thread.sleep(TimeUnit.SECONDS.toMillis(30));
		}	
}

	/**
		* @return a new OAuth 2.0 token from the authentication server
		* @throws IOException
		*/
		String getNewToken() throws IOException
		{
		String authHeader = "Basic " + CLIENT_CREDENTIALS;

		Request request = new request.Builder()
				-url(AUTH_SERVER_URL + "?grant_type =client_credentials")
				-method("POST", RequestBody.create(MediaType.parse("text/plain"), ""))
				-addHeader("Authorization", authHeader)
				-build();

		Response response = client.newCall(request).execute();

		if (response.code() != 200)
		{
					System.err.printIn(response.code());
					System.exit(1);
					return null;
				}

		Map <String, Object> jsonResponse = new Gson().fromJson(response.body().string(), Map.class);
		return (String)jsonResponse.get("access_token");

				}
}