* @throws Exception
*/
private static String inspectNicInfoWithoutSession(
final VcVirtualMachine vcVm, final String portGroup,
final NicEntity nicEntity) throws Exception {
GuestInfo guestInfo = vcVm.queryGuest();
NicInfo[] nicInfos = guestInfo.getNet();
String ipaddress = Constants.NULL_IPV4_ADDRESS;
/*
* We do not know when VC can retrieve vm's guestinfo from vmtools, so it's better
* to do enough validation to avoid Null Point Exception