当accept标头为空或未知jax-rs时的内容类型

@Stateless
@Path(\"quotes\")
public class QuoteFacadeREST extends AbstractFacade<Quote> {
    @PersistenceContext(unitName = \"RestFullDayTraderPU\")
    private EntityManager em;

    public QuoteFacadeREST() {
        super(Quote.class);
    }

    @GET
    @Override
    @Produces({\"application/xml\", \"application/json\"})
    public List<Quote> findAll() {
        return super.findAll();
    }

    @GET
    @Override
    @Produces({\"application/atom+xml\"})
    @GET
    public Feed findAllAtom() throws Exception {
        Factory factory = abdera.getFactory();
        Feed feed = abdera.getFactory().newFeed();
        feed.setId(\"tag:example.org,2007:/foo\");
        feed.setTitle(\"Feed Title\");
        feed.setSubtitle(\"Feed subtitle\");
        feed.setUpdated(new Date());
        feed.addAuthor(\"My Name\");
        feed.addLink(\"http://example.com\");
        feed.addLink(\"http://example.com\",\"self\");
        Entry entry = feed.addEntry();
        entry.setId(\"tag:example.org,2007:/foo/entries/2\");
        entry.setTitle(\"Entry title 22 44\");
        entry.setUpdated(new Date());
        entry.setPublished(new Date());
        entry.setSummary(\"Feed Summary\");
        entry.setContent(\"One line content\");
        return feed;
    }

    @Override
    protected EntityManager getEntityManager() {
        return em;
    }
}