Jeff Meyer - 2003-11-21

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A UUID must be 16 bytes long. There is no assumed "pad"
byte to use for a UUID of < 16 bytes. Hence the only valid
behavior is to throw an exception.

Since UUID's are unique, any new ones being created should
be done w/ the static method on UUIDUtil.getNewUUID().

Any existing one's to be valid must be exactly 16 bytes.
See the specification: OSF DCE UUID at:

http://www.opengroup.org/onlinepubs/009629399/apdxa.htm#
tagcjh_20