if (firm == null) {
            log.error("Firm is mandatory");
            throw new IllegalArgumentException("Firm is mandatory");
        } else if (firm.name() == null) {
            log.error("name is mandatory");
            throw new IllegalArgumentException("name is mandatory");
        } else if (firm.email() == null) {
            log.error("email is mandatory");
            throw new IllegalArgumentException("email is mandatory");
        }