B4J Question Creating a (unique) GUID


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I'm would like to generate a unique ID (GUID) in my B4J application. I know there is a thread in B4A asking the same question.

What would be the solution in B4J: also use an external Java library ?

I noticed DateTime (expressed in ticks) can't be used for this (I iterated a simple loop 250 times and only got two different tick values).

A possible solution might be to take the DateTime and add some random value ?

Other suggestions ?