Does the new specification impact forward compatibility?
The new specification requires minor changes to ejbCreate method in container-managed entity beans as well as changes in how enterprise beans access JDBC connections, environment properties, and other beans. These changes impact forward compatibility requiring small changes to any bean that relies on deprecated EJB 1.0 conventions.
Available On-line:An article in JavaWorld magazine titled "Create forward-compatible beans in EJB" addressees techniques for creating forward compatible beans.
This material is from "Appendix D" of the book Enterprise JavaBeans (O'Reilly 1999)