Invoke HTTPS URL from java & GET ACCESS TOKEN FORM WSO2IS

INVOKE HTTPS URL AND OAUTH2 GETTING AUTHENTICATION TOKEN FROM WSO2 IDENTITY SERVER pre-requisities:
1) org.apache.oltu.oauth2.common-0.31.jar
2) org.apache.oltu.oauth2.client-0.31.jar

import java.security.SecureRandom;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.apache.oltu.oauth2.client.OAuthClient;
import org.apache.oltu.oauth2.client.URLConnectionClient;
import org.apache.oltu.oauth2.client.request.OAuthClientRequest;
import org.apache.oltu.oauth2.client.response.OAuthClientResponse;
import org.apache.oltu.oauth2.client.response.OAuthJSONAccessTokenResponse;
import org.apache.oltu.oauth2.common.exception.OAuthProblemException;
import org.apache.oltu.oauth2.common.exception.OAuthSystemException;
import org.apache.oltu.oauth2.common.message.types.GrantType;

public class TestAuth {

 protected static void init() {
  try {
   SSLContext sc = SSLContext.getInstance("SSL");

   HostnameVerifier hv = new HostnameVerifier() {
    public boolean verify(String urlHostName, SSLSession session) {
     return true;
    }
   };
   TrustManager[] trustAllCerts = { new X509TrustManager() {
    public X509Certificate[] getAcceptedIssuers() {
     return null;
    }

    public void checkClientTrusted(X509Certificate[] certs,
      String authType) {
    }

    public void checkServerTrusted(X509Certificate[] certs,
      String authType) {
    }
   } };
   sc.init(null, trustAllCerts, new SecureRandom());

   SSLContext.setDefault(sc);
   HttpsURLConnection.setDefaultHostnameVerifier(hv);
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 /**
  * @param args
  */
 public static void main(String[] args) {
  init();
  try {
    OAuthClientRequest request = OAuthClientRequest
     .tokenLocation("https://localhost:9447/oauth2/token")
     .setGrantType(GrantType.PASSWORD)
     .setClientId("v79zb9om_TRquw1AVwxfsfV2inQa")
     .setClientSecret("H8S8qfY6GsjNOJKZ9y8juvkb_9Ya")
     .setUsername("admin").setPassword("admin")
     .buildBodyMessage();
   OAuthClient oAuthClient = new OAuthClient(new URLConnectionClient());
   oAuthClient.accessToken(request);
   OAuthJSONAccessTokenResponse tokenResponse = (OAuthJSONAccessTokenResponse) oAuthClient
     .accessToken(request, OAuthJSONAccessTokenResponse.class);
   System.out.println("TOKEN :" + tokenResponse.getAccessToken());
  } catch (OAuthSystemException e) {
     e.printStackTrace();
  } catch (OAuthProblemException e) {
     e.printStackTrace();
  }
 }

}