Why do people design EJB2 which is difficult to write and deploy?

Question

Many J2EE developers know that EJB2 forces them to write 'useless' Home interfaces. In addition, deployment XML are different among application servers.

So I don't know why EJB2 is part of J2EE specification for many years? Any non-technical interest are concerned?

Answer 1

The complexity of EJB2 needs more programmer human resource. So EJB2 is good for programmer employment rate. This is a reason for EJB2 survive:)

Answer 2

Are you asking why in general people still use EJB2.1?

Because:

• That's what they know, and they're frightened or don't have time for a new skill set.
• Because whoever wants that code wants it to follow a standard, and EJB2.1 is that standard.
• Because the rest of the code base is EJB2.1, and nobody has the time and/or money to refactor.
• Because the client only wants technology they trust, and what they trust is whatever hasn't failed them yet.

The same reasons anybody uses legacy technology, basically.

Answer 3

Why EJB2 is part of the J2EE specs: because it is! It once was, and so it will always be. (You cannot change a binding contract in mid-term.)

In order to not make it part of the specs, they had to come with new specs: Java EE This is the updated version of J2EE, using Java 5.

Why it is still being used:

• see above
• the client has no money/time to change this
• the client uses and old version of the application server
• it works, so we do not change it