1. Jackson ObjectMapper objectMapper = new ObjectMapper(); String json = objectMapper.writeValueAsString(object); ObjectMapper objectMapper = new ObjectMapper(); Object object = objectMapper.readValue(json, Object.class); 2. Gson Gson gson = new Gson(); String json = gson.toJson(object); Gson gson = new Gson(); Object object = gson.fromJson(json, Object.class); 3. JSON-B Jsonb jsonb = JsonbBuilder.create(); String json = jsonb.toJson(object); Jsonb jsonb = JsonbBuilder.create(); Object object = jsonb.fromJson(json, Object.class); 4. Fastjson String json = JSON.toJSONString(object); Object object = JSON.parseObject(json, Object.class);