@PersistenceUnit/@PersistenceContext on bean class does not work

This assertion fails:

@Stateless
@PersistenceUnit(name = "emf/caveatemptor1", unitName = "caveatemptorDatabase")
public class InfrastructureBean implements Infrastructure {

@Resource
SessionContext ctx;

public void lookupEntityManagerFactoryInJNDI()

{ EntityManagerFactory emf = (EntityManagerFactory)ctx.lookup("emf/caveatemptor1"); assert emf != null; }

}

The trace log is unusable, it contains no information about ENC population.

Regular field/setter injection of a PU/EMF works, and it also correctly populates the ENC.