Allow `@JsonAnySetter` to flow through Creators

[bimargulies]

I could speed up some code if I could write:

@JsonCreator
public MyClass(@JsonProperty("a") String a, @JsonAnySetter Map<String, Object> leftovers) {}

[whiskeysierra]

👍 Is this something that you already considered putting in?

[cowtowncoder]

Considered, yes, had time to try to tackle, no. Would definitely be nice thing to support.

[huhlig]

Any likelihood this will land in 3.x?

[davide-imbriaco]

Hi,
I would also really like this (allows for immutable beans, and validation of data in constructor method).

[cowtowncoder]

@huhlig It would be nice to get it there, but I can not predict whether it will or not. I do think it would be great to get it to work but there are so many things to work on...

I will keep this in mind as one of "more/most wanted" issues.

[davidmoten]

I'd also like to see this feature. As a workaround for the immutability enthusiasts, here's an example of using JsonAnySetter in an immutable class (swap out the Map/HashMap for an immutable equivalent as you like). The trick is that the JsonAnySetter method can be made private.

@JsonAutoDetect(fieldVisibility = Visibility.ANY, creatorVisibility = Visibility.ANY, setterVisibility = Visibility.ANY)
public static final class WithMap {

    @JsonProperty("name")
    private String name;

    @JsonAnyGetter
    private Map<String, String> map;

    @JsonCreator
    public WithMap(@JsonProperty("name") String name) {
        this.name = name;
        this.map = new HashMap<>();
    }
    
    public WithMap(String name, Map<String, String> map) {
        this.name = name;
        this.map = map;
    }
    
    @JsonAnySetter
    private void put(String key, String value) {
        map.put(key, value);
    }
    
    public String name() {
        return name;
    }

    public Map<String, String> map() {
        return Collections.unmodifiableMap(map);
    }
}

[cowtowncoder]

@JooHyukKim I think we could use a "failing" test case for this, as pre-cursor to #3439.

Note, too, that this is definitely one of Most-Wanted issues open.