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your cascade file was not loaded properly.

try to replace:

getClass().getResource("/haarcascade_frontalface_alt.xml").getPath()

witth the absolute path to thecascade file. most probably you need to do the same for the image.

your cascade file was not loaded properly.

try to replace:

getClass().getResource("/haarcascade_frontalface_alt.xml").getPath()

witth with the absolute path to thecascade file. most probably you need to do the same for the image.