带有@ Xml *批注的Java EE RESTful服务JSON编组415状态

Question

I have simple Java EE RESTful service, which used JAX-RS (Jersey), JPA (EclipseLink) and JAXB (EclipseLink MOXy) on Payara 4.1.1.154 (GlassFish 4.1.1 fork - http://payara.fish ).

I use two entityes Radio and Stream with bidirectional link between them:

Radio entity:

@Entity
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Radio {

    @Id
    @GeneratedValue
    private long id;

    @Column(unique = true, nullable = false)
    private String name;

    @Column(nullable = false)
    private String genre;

    @OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL)
    @XmlIDREF
    private List<Stream> streams;

    @Version
    private long version;
    ... constructors, getters, setters
}

Streams entity

@Entity
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Stream {

    @Id
    @GeneratedValue
    @XmlID
    private long id;

    private String name;
    private String mountPoint;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn
    private Radio radio;

    @Version
    private long version;
    ... constructors, getters, setters
}

And RESTFul resource handler:

@Path("/radios")
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class RadioResource {

    @Inject
    private RadioService radioService;

    public RadioResource() {}

    @GET
    @Path("/{radioId}")
    public Radio getById(@PathParam("radioId") long id) throws com.roks.radio.rt.services.NotFoundException {
        return radioService.findById(id);
    }

    @POST
    public Response create(Radio radio, @Context UriInfo uriInfo) throws AlreadyExistsException {
        radioService.create(radio);
        return Response.created(
                uriInfo.getAbsolutePathBuilder().path(
                        String.valueOf(radio.getId())
                ).build()
        ).entity(radio).build();
    }
}

When doing POST request with type of application/json server responce with 415 status code (mediatype not supported). When I remove @XmlID and @XmlIDREF annotations from code, all working fine (201 Created responce), except missing "streams" field in JSON output.

I think "streams" not present because of circular reference in result JSON object when streams list empty. But I try to remove this reference with @XmlID and @XmlREFID annotations, but JSON marshalling stop working.

In JSON output i mainly need "streams" field with streams IDs.

What is wrong with my code?

Answer 1

try to use the annotation

@JsonProperty

on the getters you want to be marshalled in json (org.codehaus.jackson.annotate.JsonProperty).

Are you using jersey-media-moxy.jar in your project? It's purpose is to bind objects to JSON. I used it once but i'm not sure i still have the source.