how to install dropbox java sdk. steps to connect java to dropbox. i got secret key. but the example given for java api for dropbox throws exception.

public static void main(String[] args) throws IOException, DbxException {
// Get your app key and secret from the Dropbox developers website.

    final String APP_KEY = "my key";
    final String APP_SECRET = "my appsecret";

    DbxAppInfo appInfo = new DbxAppInfo(APP_KEY, APP_SECRET);
    DbxRequestConfig config = new DbxRequestConfig("x",Locale.getDefault().toString());

    DbxWebAuthNoRedirect webAuth = new DbxWebAuthNoRedirect(config, appInfo);


    String authorizeUrl = webAuth.start();
    System.out.println("1. Go to: " + authorizeUrl);
    System.out.println("2. Click \"Allow\" (you might have to log in first)");
    System.out.println("3. Copy the authorization code.");
    String code = new BufferedReader(new InputStreamReader(System.in)).readLine().trim();

    DbxAuthFinish authFinish = webAuth.finish(code);

    DbxClient client = new DbxClient(config, authFinish.accessToken);

    System.out.println("Linked account: " + client.getAccountInfo().displayName);
}

}
output:

Exception in thread "main" com.dropbox.core.DbxException$NetworkIO: java.net.UnknownHostException: api.dropbox.com

how to solve this exception