Fubuchi

@Getter
@AllArgsConstructor
@NoArgsConstructor
public class ComplexData {
    private int id;
    
    @JsonSerialize(using = PairSerializer.class)
     // if left == right, R will overwrite L in the json result
    @PairIdentify(left = "anyName1", right = "anyName2")
    private Pair<L, R> data; // L, R is any type