JSON to java object

@Autowired

ModelMapper modelMapper;

Map<String, Object> metaRequest = dto.getMeta();

MetaSort sort = null;

if (null != metaRequest.get("sort")){

sort = modelMapper.map(metaRequest.get("sort"), MetaSort.class);

}

java object to JSON

@Autowired

ObjectMapper objectMapper;

objectMapper.writeValue(new File("./test.json"),listServiceRequestDTO);