Interceptors for non EJB

Question

Hi,
does the jee standard covers interceptors for non EJB classes? I'm using Glassfish and it worked for a plain java classes e.g.:
@Interceptors(TraceInterceptor.class)
public class PlainClass {
     public String doSomething() {
          return "somthing";
Hoever when I use the intercepter with a DAO class that's depending an an EntityManager e.g.:
@Interceptors(TraceInterceptor.class)
public class PersonDao implements IPersonDao {
     @PersistenceContext
     private EntityManager em;
     @Override
     public Person getById(Integer id) {
          return em.find(Person.class, id);
I get a NullPointer exeption because the Entity Manger is not injected.
so my question is: does the jee standard covers interceptors for non EJB classes?
Regards
Sebastian

Answer 1

Hi,
thanks for your response.
When I remove the @Interceptors annotation from the PersonDao everything works fine including the injection of the entity manager. When I add the @Interceptors annotation I get a null pointer at em.find(Person.class, id).
I’m new to JEE6 because I have worked with Spring the last 6 years. Accidently I never used the @Named annotation. Surprisingly that is no problem (at least in Glassfish).
Anyhow I added the @Named annotation to the DAO but that not changed anything, I still got a null pointer. What’s wrong?
@Interceptors(TraceInterceptor.class)
@Named
public class PersonDao implements IPersonDao {
     @PersistenceContext
     private EntityManager em;
     @Override
     public Person getById(Integer id) {
          return em.find(Person.class, id);
@Stateless
@Interceptors(TraceInterceptor.class)
public class TestSrv implements ITestSrv {
     @Inject
     private IPersonDao personDao;
     @Override
     public Person getPerson(Integer id) {
          return personDao.getById(id);
Best regards
Sebastian