Hi Chintan, Which application server are you using? Regardless of the server type, I'd start by checking the server logs. They may show some sort of injection failure due to a data source or some other configuration problem.
-Jeremy On Thu, Apr 7, 2011 at 6:42 PM, chintan4181 <[email protected]> wrote: > Hi, > > I am trying to access JPA entities using Stateless EJBs, Earlier i have one > Stateless EJB which was injecting PersistenceContext using annotation. It > is > working fine. Since Stateless EJB is haveing data access code, I have > introduced DAO mechanism to separate data access from EJB. For that I have > added below classes > > GenericeDAO: > public interface GenericDAO<E,K extends Serializable> { > > void persist(E entity); > void remove(E entity); > E findById(K id); > > } > > ApplicationDAO: defined DAO as Stateless EJB > @Stateless > public class ApplicationDAO<E,K extends Serializable> implements > GenericDAO<E,K> { > > protected Class entityClass; > > @PersistenceContext(name = "MIApplicationJPA", unitName = > "MIApplicationJPA") > public EntityManager entityManager; > > @SuppressWarnings("unchecked") > public ApplicationDAO() { > ParameterizedType genericSuperclass = (ParameterizedType) > getClass().getGenericSuperclass(); > this.entityClass = (Class) > genericSuperclass.getActualTypeArguments()[1]; > } > > public void persist(E entity) { > entityManager.persist(entity); > } > > public void remove(E entity){ > entityManager.remove(entity); > } > > public E findById(K id) { > E entity; > entity = (E) entityManager.find(entityClass, id); > return entity; > } > > } > > CertDAOImpl: > public class CertDAOImpl extends ApplicationDAO<Cert,Integer>{ > > @Override > public Certificate findByCertNumber(String certId) throws Exception > { > > Certificate cert = (Certificate) > entityManager.createNamedQuery("findByCert_Number") > > .setParameter("Cert_Number",certId) > > .getSingleResult(); > return cert; > } > } > > However when i access entityManager from CertDAOImpl. entitymanage is > coming > as null. Even though it is in same EJB jar. can anybody tell me what could > be the issue? > > Thanks > Chintan > > -- > View this message in context: > http://openjpa.208410.n2.nabble.com/PersistenceContext-is-null-tp6251959p6251959.html > Sent from the OpenJPA Users mailing list archive at Nabble.com. >
