org.codehaus.jackson.map.JsonMappingException: Can not instantiate value of type [simple type, class models.Job] from JSON String

Question

i use the playframework and tried to deserialize some json into a java object. It worked fine, exept the relationship in the model. I got the following exception

Answer 1

Either you change your JSON in order to describe your "job" entity :

{
   "name":"asd",
   "filepath":"blob",
   "contenttype":"image/png",
   "description":"asd",
   "job":{
      "id":"1",
       "foo", "bar"
   }
}

or you create a constructor with a String parameter in your Job bean:

public Job(String id) {
// populate your job with its id
}

Answer 2

when limited time +ee: +jax-rs && +persistence, +gson; I have solved it then as:

@Entity
@XmlRootElement
@Table(name="element")
public class Element implements Serializable {
    public Element(String stringJSON){
        Gson g = new Gson();
        Element a = g.fromJson(stringJSON, this.getClass());
        this.setId(a.getId());
        this.setProperty(a.getProperty());
    }

    public Element() {}
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private Integer id;
    ...
}