@Test
public void testIgnore(){

    Map<String,String> map = new HashMap<>();
    map.put("ST","31");
    map.put("Flag","N");
    map.put("CP","&&k=v&&");
    ObjectMapper objectMapper = new ObjectMapper();
    objectMapper.disable(FAIL_ON_UNKNOWN_PROPERTIES);
    objectMapper.addMixIn(Data.class,DataDeserializationMixin.class);
    Data data = objectMapper.convertValue(map, Data.class);
    assertNull(data.getDataFlag());
}