Java Jackson org.codehaus.jackson.map.exc.UnrecognizedPropertyException

Question

I am binding a JSON response to my class using Jackson. Everything works great except when there are more fields in my JSON response than my class defines. I want Jackson to ignore the fields that do not exist in my JSON response. This is due to compatability for future versions. If I add a new field I do not want previous versions of my client to crash.

Ideas?

ObjectMapper mapper = new ObjectMapper(); // can reuse, share globally
        PromoResponse promoResponse = mapper.readValue(r, PromoResponse.class);

Answer 1

You can put the @JsonIgnoreProperties(ignoreUnknown=true) annotation on your PromoResponse class.

Answer 2

I believe you would want to do something like this after you declare your mapper object:

mapper.configure(DeserializationConfig.Feature.FAIL_ON_UNKNOWN_PROPERTIES, false);

-Dan