Read embedded object in Jackson

Question

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.

Answer 1

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; }