/**
     * Default constructor.
     */
    public AccessTokenService() {
        // nothing
    }

    /**
     * The behavior of access token.
     */
    @Resource
    protected AccessTokenBhv accessTokenBhv;

    /**
     * The Fess configuration.
     */
    @Resource
    protected FessConfig fessConfig;

    /**
     * Get the list of access tokens.