I am using linkedin-j library for authenication
I want to persist the LinkedIn Access token object.
LinkedInOAuthService oAuthService = LinkedInOAuthServiceFactory
    .getInstance()
    .createLinkedInOAuthService(
        LK_CONSUMER_KEY, LK_CONSUMER_SECRET
    );
//Need to persist this accessToken
LinkedInAccessToken accessToken = oAuthService
    .getOAuthAccessToken(liToken, oauthVerifier);