EJB specifications and Java versions

Hi,

I am just starting to learn EJBs and the first thing that I am trying to figure out is the relationsip between EJB specifications and Java versions.

Must EJB 2.0, EJB 2.1, EJB 3.0 be used with particular versions of Java? i.e. Java 1.3, 1.4, 1.5 etc...

If anyone could point me to a web site I would be grateful. I have had a look at Sun's web site but it isn't clear.

Many Thanks

EJB 2.0 was part of J2EE 1.3 platform, which was on top J2SE 1.3 or JDK 1.3.x
EJB 2.1 was part of J2EE 1.4 platform, which was on top of J2SE 1.4 or JDK 1.4.x
But EJB 2.1 specification requires backward compatibility for EJB 2.0, so the containers supporting EJB 2.1 and running in JDK 1.4.x will be able to run EJB 2.0 beans as well.

EJB 3.0 is part of Java EE 5 platform, which required Java SE 5 (JDK 5) for annotations etc.. again EJB 3 spec requires backward compatibility for earlier version of the specifications.

-raghu