I am using successfully seam-persistence in my application.  However, one of my bean cannot use an injected entity-manager :

Caused by: javax.naming.NameNotFoundException: Lookup of java:comp/UserTransaction not allowed for Container managed Transaction beans

here is my code :

@TransactionAttribute
public class CurrentFileStore {
    @Inject
    @Client
    EspaceClient currentWorkspace;
    
    @Inject
    EntityManager em;
    
    @Produces
    @SessionScoped
    public FileStore getCurrentFileStore() {
        TypedQuery<FileStore> query = em.createQuery("SELECT store FROM FileStore store WHERE store.name = ?1", FileStore.class);
        query.setParameter(1, currentWorkspace);
        FileStore store = query.getSingleResult();
        return store;
    }
}

Is this because of the producer method ?  Like I said before, I also have a Service only annotated @TransactionAttribute, injecting the entity manager in the same way, but the service is working perfectly.

Can someone help or explain if I'm doing wrong ?