Serializing a field as json

Question

I need to send a JSON body to REST service. Unfortunately, service is quite old and I need to send a POJO, containing JSON string field. So it looks like this:

class SomeData {
    int id;
    SomePojo jsonField;

    ...
}

So SomeData should be sent like this:

{'id': 1, 'jsonField': some_json_string}

I haven't found any Jackson magic annotation to make it works and I've got a doubt it can be made somehow because of type erasure in Java and it may not be possible to write custom serializer for this purpose but I'm not sure.

Could you please suggest any idea of how I can make it work or workaround the issue? Thank you very much in advance!

Answer 1

You need to implement your own serialiser, you can then configure it at ObjectMapper level, e.g.:

ObjectMapper mapper = new ObjectMapper();

SimpleModule module = new SimpleModule();
module.addSerializer(SomeData.class, new SomeDataSerialiser());
mapper.registerModule(module);

You can find the complete example here.