Read embedded object in Jackson

jackson, java, json, mapping

Solution

To deal with an "embedded" object you should use `@JsonUnwrapped` — it's an equivalent of the Hibernate's `@Embeddable`/`@Embedded`.

class Item {
    private String title;

    @JsonProperty("date")
    private Date createdAt;

    // How to map this?
    @JsonUnwrapped
    private Author author;
}

Problem

I'm trying to read a legacy JSON code using Jackson 2.0-RC3, however I'm stuck with an "embedded" object. Given a following JSON: ``` { "title": "Hello world!", "date": "2012-02-02 12:23:34". "author": "username", "author_avatar": "http://.../", "author_group": 123, "author_prop": "value" } ``` How can I map it into the following structure: ``` class Author { @JsonPropery("author") private String name; @JsonPropery("author_avatar") private URL avatar; @JsonProperty("author_group") private Integer group; ... } class Item { private String title; @JsonProperty("date") private Date createdAt; // How to map this? private Author author; } ``` I was trying to do that with `@JsonDeserialize` but it seems that I'd have to map the entire `Item` object that way.

Original source