Java将JSON的一部分反序列化为对象，其余部分反序列化为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?

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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 = {}
}

Answer 1

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);
    }
}