weird DBObject equals behaviour

    @Test
    public void getLemmaTest() {
        Object[] criteria = new String[1];
        criteria[0] = "testtest";
        DBObject queryObj = QueryBuilder.start("declensions").in(criteria).get();
        DBObject queryObj2 = QueryBuilder.start("declensions").in(criteria).get();
        assertTrue(queryObj.equals(queryObj2)); //passes
    }

    @Test
    public void getLemmaTest() {
        Object[] criteria = new String[1];
        criteria[0] = "testtest";

        Object[] criteria2 = new String[1];
        criteria2[0] = "testtest";

        DBObject queryObj = QueryBuilder.start("declensions").in(criteria).get();
        DBObject queryObj2 = QueryBuilder.start("declensions").in(criteria2).get();
        assertTrue(queryObj.equals(queryObj2)); //fails
    }