Excel 2013 error OData4J JPAProducer odata feed

Question

I have created a very basic producer example using OData4J (JPAProducer) Now I can see the info about schema on browser normal. However the excel 2013 data connection wizard showing error. I tried Excel with http://services.odata.org/V3/OData/OData.svc/ worked fine. What am I doing wrong.

Any help would be greatly appreciated.

 public static JPAProducer createProducer() {
Map properties = new HashMap();
    properties.put(PersistenceUnitProperties.NON_JTA_DATASOURCE, DatabaseUtil.getDataSource());
    javax.persistence.EntityManagerFactory factory = Persistence.createEntityManagerFactory("persistentunit",
            properties);
JPAProducer producer = new JPAProducer(factory, "", 50);
     return producer;
    }


public static void startService() {
        DefaultODataProducerProvider.setInstance(createProducer());
        hostODataServer("http://localhost:8887/JPAProducerExample.svc/");
    }

    public static void main(String[] args) {
        startService();

    }


    private static void hostODataServer(String baseUri) {
        ODataServer server = null;
        try {
            server = startODataServer(baseUri);

        } catch (Exception e) {
            System.out.print(e.getLocalizedMessage());
        } 
    }


    private static ODataServer startODataServer(String baseUri) {
        return createODataServer(baseUri).start();
    }


    private static ODataServer createODataServer(String baseUri) {
        return new ODataJerseyServer(baseUri, ODataApplication.class, RootApplication.class);
    }