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NONE of opencv's functionality from the highgui module is wrapped into java (you can't assume access to the underlying (os based) gui from java)

instead (as of opencv4) there is a "mock" highgui module in java, which tries to replicate the basic imshow() / waitKey() things with native java means

unfortunately, this does not go as far as simulating the selectROI() functions, you'll have to come up with your own replacement.