This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
We are using a VMID to generate a unqiue ID for creating a filename on the system. We considered using a date/time approach but this wouldnt be sufficient as multiple instances of an application could be deployed to write out files to a single place.
Is this considered a good way to generate a unique id?
Also, will the ID always be 42 characters long (if you ignore the '-' symbols)? c293d3a4287f22e4:4c7cec6a:10a5f903064:-8000