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The code works for me.

What happens when you execute the code posted in post#1? Does it copy the directory?

To see how to copy the contents of a directory you need to read what I referred to in post#6.

Please explain where your problem is.
Your last statement was: this is perfectly working

Have you solved your problem?

What folder is missing at the end of the copy?

I assume that is from the API doc for the copy() method. Is that right?

The API doc says:
This method (copy) can be used with the walkFileTree method to copy a directory and all entries in the directory,

There is a link there to follow.

Where does the doc say there will be anything in a copied directory?

Are you using the correct method(s) for copying the contents of a directory?
What does the API doc for the copy() method say?