Google Api OAuth2 java.lang.IllegalStateException: unable to load NetHttpTrasnport

[Ashish Agre]

I'm unable to get the access token from the google, i have received the code but...

System.out.println("The code Obtained is " + str);
System.out.println("The token Obtained is " + str);
		/*
		 * AccessTokenResponse accessTokenResponse = new
		 * GoogleAccessTokenRequest.GoogleAuthorizationCodeGrant( new
		 * NetHttpTransport(), new GsonFactory(), cid,
		 * "123", str.trim(), "index.jsp").execute();
		 */

		NetHttpTransport netTransport = new NetHttpTransport();
		JsonFactory jsonFactory = new JacksonFactory();
		System.out.println("JsonFactoryLoaded : " + jsonFactory.toString());
		System.out
				.println("NetHttpTransport loaded " + netTransport.toString());

		/*
		 * System.out.println("Access token is " +
		 * accessTokenResponse.accessToken);
		 * System.out.println("Refresh Token is token is " +
		 * accessTokenResponse.refreshToken);
		 * System.out.println("Token scope is " +accessTokenResponse.scope);
		 */