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Try it like that :

MatOfInt mOi= new MatOfInt();
Imgproc.convexHull(matOfPoint, mOi); 
        int[] intlist = mOi.toArray();
        List<Point> l = new ArrayList<Point>();
        l.clear();
        for (int i = 0; i < intlist.length; i++) {
            l.add(matOfPoint.toList().get(mOi.toList().get(i)));
}