I look up collisions every time I generate an ID and it's also sychronized when the node is broadcasted on the global cluster.

UUIDs use time and origin to make things unique something that is both an advantage and also a problem, say for example you want to hide origin and time?!

Also as danuker said, why add a dependency for no real benefit, Log4J should have proved to you that it's better to write minimalistic implementations yourself.

Finally there is a difference between reinventing the wheel and improving the wheel: http://move.rupy.se/file/wheel.jpg

I made a distributed database in 2000 lines of Java.