byte[] A = Bytes.toBytes("A");
byte[][] FAMILIES = new byte[][] { A };
Configuration conf = HBaseConfiguration.create();
HRegion region = initHRegion(TABLE, getClass().getName(), conf, FAMILIES);
RegionCoprocessorHost h = region.getCoprocessorHost();
h.load(NoDataFromScan.class, Coprocessor.PRIORITY_HIGHEST, conf);
h.load(EmptyRegionObsever.class, Coprocessor.PRIORITY_USER, conf);
Put put = new Put(ROW);
put.add(A, A, A);
region.put(put);