entities.add(new Entity(1001, "ljw2083"));
entities.add(new Entity(1002, "wenshao"));
entities.add(new Entity(1003, null));
entities.add(new Entity(null, null));
List<Object> result = (List<Object>) path.eval(entities);
Assert.assertEquals(2, result.size());
Assert.assertSame(entities.get(2), result.get(0));
Assert.assertSame(entities.get(3), result.get(1));
}