I'm going to take the SCBCD exam and I've started to learn JPA.
Are there any questions on EJB 2 compatibility like EJB 2.1 Entity Bean Component Contract (chapters 8-11 in EJB 3.0 spec) on the exam?
It's not directly mentioned in objectives, but I would rather make sure that it's not necessary to study that material...
I just read it for a general understanding of the differences and did not do a deep study, because for me personally I use only EJB3. So my suggestion would be don't study it.