public void testSerialization2() {
        DefaultStatisticalCategoryDataset d1 
            = new DefaultStatisticalCategoryDataset();
        d1.add(1.2, 3.4, "Row 1", "Column 1");
        DefaultStatisticalCategoryDataset d2 = null;
        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream();
            ObjectOutput out = new ObjectOutputStream(buffer);
            out.writeObject(d1);
            out.close();

            ObjectInput in = new ObjectInputStream(
                    new ByteArrayInputStream(buffer.toByteArray()));
            d2 = (DefaultStatisticalCategoryDataset) in.readObject();
            in.close();
        }
        catch (Exception e) {
            fail(e.toString());
        }
        assertEquals(d1, d2);