How can I clear the clipboard?

Hi.
I'm working with images, I do different operations with image, after that I'm saving it (the path is the same), and I want to see the new image.
The problem is that when I create new object the path remain the same, and because of that Java uses clipboard and shows the old image and not the updated.
So, how can I clear the clipboard?

Maybe it isn't clipboard but cache?
so,how can I clear cache?

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