Collecting unknown properties with Jackson

Question

I\'m using Jackson for creating Java objects from JSON. Let\'s suppose I have a JSON string like this:

{\"a\":\"a\", \"b\":\"b\", \"c\":\"c\"}

Answer 1

I don't know of any built-in tool that does this. You can write your own with @JsonAnySetter

Marker annotation that can be used to define a non-static, two-argument method (first argument name of property, second value to set), to be used as a "fallback" handler for all otherwise unrecognized properties found from JSON content.

Use it like

@JsonAnySetter
public void ignored(String name, Object value) {
    // can ignore the 'value' if you only care for the name (though you still need the second parameter)
    System.out.println(name + " : " + value);
}

within the class you're deserializing to, eg. your A class.