In my research this project ,i have a question .Resources.java  has What Effect? thanks i dont understand when i delete this  ,why this project don't work .please email wfkjzyxy_001@163.com thanks

@Stateful

@RequestScoped

public class Resources {

    @PersistenceContext(type = PersistenceContextType.EXTENDED)

    private EntityManager em;

    @Produces

    public EntityManager getEm() {

        return em;

    }

    @Produces

    public Logger getLogger(InjectionPoint ip) {

        String category = ip.getMember().getDeclaringClass().getName();

        return Logger.getLogger(category);

    }

}