Java deserializing part of the JSON into object and the rest into JsonObject

Question

I was looking everywhere how to deserialize part of the JSON into an object and the rest into JsonObject.

for example:

{
  "id" : "123",
  "message" : {"subject" : "test sub" , "body" : "test body"}
}

I want to deserialize this JSON into this class:

public class className {
    private String id;
    private transient JsonObject message;

    // getters and setters
}

The problem is that after the deserialization I get empty object {}inside "message".

Does anyone have any idea about it?

======================================================

EDIT:

A little more info, I am using Spring MVC, the JSON is being sent by POST message into my controller.

The controller function looks like this:

public @ResponseBody String publish(@RequestBody final className input, final HttpServletRequest request,
        final HttpServletResponse response) {
    //input.message = {}
}

Works fine for me. Please post a minimal reproducible example. — shmosel
– shmosel, Commented Mar 22, 2017 at 18:42
This works fine for me. Are you sure you're using the right JsonObject type from Gson? Please provide a minimal reproducible example. — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Mar 22, 2017 at 18:42
I am using com.google.gson.JsonObject. I am getting the input into my REST controller using POST request with the JSON in the body. the controller looks like this: public String sendMessage(@RequestBody final className input, ...); I am stopping with breakpoint right after the entrance to the function and check my input, the ID is there but message is empty — eladyanai
– eladyanai, Commented Mar 22, 2017 at 19:05
So Spring MVC and potentially Jackson are involved. Please provide those details in your question. Is Jackson on the classpath? — Sotirios Delimanolis
– Sotirios Delimanolis, Commented Mar 22, 2017 at 19:09

Lyubomyr Shaydariv · Accepted Answer · 2017-03-23 01:14:43Z

3

That is because Spring tries to parse your object with Jackson library while your object holds Gson objects (which can't be parsed with Jackson).

Please refer Configure Gson in Spring.

@Configuration
@EnableWebMvc
public class Application extends WebMvcConfigurerAdapter {

    @Override
    public void configureMessageConverters(List<HttpMessageConverter < ? >> converters) {
        GsonHttpMessageConverter gsonHttpMessageConverter = new GsonHttpMessageConverter();
        converters.add(gsonHttpMessageConverter);
    }
}

edited Mar 23, 2017 at 1:14

Lyubomyr Shaydariv

21.3k12 gold badges70 silver badges108 bronze badges

answered Mar 22, 2017 at 19:22

Erik

461 bronze badge

Sign up to request clarification or add additional context in comments.

2 Comments

eladyanai Over a year ago

Thank you for your answer. I am using Spring Boot so I have added to my appConfig: @Bean public HttpMessageConverters customConverters() from the tutorial and on my Application I added @EnableAutoConfiguration(exclude = { JacksonAutoConfiguration.class }) But now "message" is null. not even '{}'. Do you have any other Idea?

eladyanai Over a year ago

OK! I got it. the problem with the null was because I had transient keyword on the message field. I have removed the transient and now it works! Thank you very much!

Collectives™ on Stack Overflow

Java deserializing part of the JSON into object and the rest into JsonObject

1 Answer 1

2 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Related