Not sure what you mean. You can't do that in EJB 3.0, that's a Java Contexts and Dependency Injection (JSR 299) feature that is yet to be standardized as part of Java EE 6.
Regards,
Reza
Independent Consultant — Author, EJB 3 in Action — Expert Group Member, Java EE 6 and EJB 3.1
With a little knowledge, a cast iron skillet is non-stick and lasts a lifetime.