* The value is, e.g. admin <br>
     * comment: Admin user names for authentication.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getAuthenticationAdminUsers();

    /**
     * Get the value for the key 'authentication.admin.roles'. <br>
     * The value is, e.g. admin <br>
     * comment: Admin role names for authentication.