@EJB and @ PersistenceContext not working in JBOSS.5.1.0.GA?

[Ryan Jimmy]

I am implementing a Rest Webservice Using RESTEasy and JPA for persistance and deploying in JBOSS.5.1.0.GA. JPA is working fine when we are getting EMF and EM programatically

emf = Persistence.createEntityManagerFactory(Constants.GTL_ORACLE_PERSISTENCE_UNIT);
em =   emf.createEntityManager();

But when I tried to inject EntityManager using @PersistenceContext . I am getting null value.

Now we tried it using @Stateless EJB but that too failed in our service class.

Our Service class is as follows:-

public class ProductResourceService implements ProductResource {

private boolean oneTime = false;
@EJB(mappedName = "MyService")
private PersistanceService persistanceService;


@Override    
public String saveProduct(@PathParam("id") String id) {
    System.out.println("requset got id[" + id + "]");



    Product product = new Product();
    product.setName(id);
    product.setDescription("testing Persistance");
    String status = "Failed";
    try {
        System.out.println("persistanceService " + persistanceService);           
        persistanceService.saveObject(product);

        status = "Success";
    } catch (Exception e) {
        System.out.println("Error" + e);          
    }
    return status;
}

--------------------------------------------------------

PersistanceService.java
------------------------

@Local(PersistanceServiceLocal.class)
@Stateless(mappedName = "MyService")
public class PersistanceService implements PersistanceServiceLocal {

private EntityManager em;

@PersistenceContext
public void setEm(EntityManager em) {
    this.em = em;
}


public void saveObject(Object obj) {

    try {
        em.getTransaction().begin();
        em.persist(obj);
        em.getTransaction().commit();
    } finally {
        em.close();
    }

}

public Object getSingleResultSet(String namedQuery) {

    Query query = null;
    try {
        query = em.createNamedQuery(namedQuery);
    } finally {
        em.close();
    }
    if (query == null) {
        return null;
    }
    return query.getSingleResult();

}

I have persistence.xml configured in this way.

<persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence  http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

<persistence-unit  name="productDetails" transaction-type="JTA" >
    <provider>org.hibernate.ejb.HibernatePersistence</provider>
    <jta-data-source>java:/OracleDS</jta-data-source>

    <class>com.gtl.cdi.rest.model.Product</class>
    <properties>
        <property name="hibernate.dialect" value="org.hibernate.dialect.OracleDialect" /> 
        <property name="hibernate.hbm2ddl.auto" 
                  value="create-drop" />

    </properties>


</persistence-unit>

Can you please tell me where I went wrong.I have been spending several days trying to resolve it....Is it that @PersistenceContext is not supported by JBOSS 5.1.0GA???

Any help will be appreciated.