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i solved this by creating a 3x3 Mat and putting the data by myself

   Mat ukernel = new Mat(3, 3, CvType.CV_8U);
        ukernel.put(0, 0, (byte) 0);
        ukernel.put(0, 1, (byte) 1);
        ukernel.put(0, 2, (byte) 0);
        ukernel.put(1, 0, (byte) 1);
        ukernel.put(1, 1, (byte) 1);
        ukernel.put(1, 2, (byte) 1);
        ukernel.put(2, 0, (byte) 0);
        ukernel.put(2, 1, (byte) 1);
        ukernel.put(2, 2, (byte) 0);
        Imgproc.dilate(outerbox, outerbox, ukernel);