Thanks for your answer, indeed it would help 
My idea is to send an image via socket to the path and overwrite it periodically. The new image has the same name, so it’s not necessary to change the path. I thought that if I read as a BufferedImage, it would change…
Maybe, if I generate the file .urcap, it contains all the elements and it’s not possible to add new ones. Am I wrong?
Anyway, thanks for your help !