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);
    }
}

Uh oh!

Allow @JsonAnySetter to flow through Creators #562

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Allow `@JsonAnySetter` to flow through Creators #562