maxInactive = interval * 1000L; canExpire = true;
	public void setMaxInactiveInterval(int interval) {		if (isValid) {			if (interval == -1) {				maxInactive = -1;				canExpire = false;			} else {				if (interval < 0) {					throw new IllegalArgumentException("negative value"); //$NON-NLS-1$				} else {					maxInactive = ((long) interval) * 1000L;					canExpire = true;				}			}		}	}