@Test
  public void testUnExport() throws Exception {
    RMITestImpl servant = new RMITestImpl();

    assertNotNull(Util.getTie(servant));

    PortableRemoteObject.unexportObject(servant);

    assertNull(Util.getTie(servant));
  }
  @Test
  public void testExport() throws Exception {
    RMITestImpl servant = new RMITestImpl();

    assertNotNull(Util.getTie(servant));
  }