Jackson_1

@JsonTypeInfo(
        use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.EXISTING_PROPERTY, property = "type")
@JsonSubTypes(value = {
        @JsonSubTypes.Type(value = A.class, name = "type_a"),
        @JsonSubTypes.Type(value = B.class, name = "type_b")
})
@JsonInclude(JsonInclude.Include.NON_NULL)