While working with another engineer we ran into a strange issue where the sytem clock on a server would jump ahead.  Normally this would not be a problem but the CreateUUID() function is dependent on time in order to not create a duplicate value.  It waits in a while loop for a number of milliseconds and then returns the value.  If the time jumps ahead it will sit in this loop until the we catch up with the clock time.  This could turn pretty ugly if you have alot of code calling createUUID() because the particular method responsible for the UUID is synchronized and  all requests will que up waiting for the method to complete.  The problem turned out to be a JVM bug on windows and the workaround is provided in the following technote

http://www.macromedia.com/support/coldfusion/ts/documents/createuuid_clock_speed.htm

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