why do I get different result when use different ways to serialize emoji char.

[ghost]

0. at first

• springboot version
  1.5.12
• jackson version
  2.8.11

1.code

import javax.annotation.Resource;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {
    @RequestMapping(value = "/model")
    public Model model() {
        Model model = new Model();
        model.setId(1);
        model.setEmoji("\uD83D\uDE33");
        return model;
    }

    @RequestMapping(value = "/string")
    public String modelString() {
        Model model = new Model();
        model.setId(1);
        model.setEmoji("\uD83D\uDE33");
        return serialize(model);
    }

    @Resource
    private ObjectMapper objectMapper;

    <T> String serialize(T object) {
        try {
            return objectMapper.writeValueAsString(object);
        } catch (JsonProcessingException ex) {
            throw new RuntimeException(ex);
        }
    }
}

2. different results

• /model

{"id":1,"emoji":"\uD83D\uDE33"}

• /string

{"id":1,"emoji":"😳"}

3. question

why do we get diffent results？how to get the string() 's result in model()?

[ghost]

The same as FasterXML/jackson-core#223