The only real similarity between EJB's and normal JavaBeans is that they are
both based on component models. EJB's provide a java representation of some
data in a database - e.g. 1 EJB will equal 1 row in the table, 1 EJB class
is tied to one table. XML is used to tie an EJB and its data to a database.
There is a bit of a problem with this approach, in that a typical OO design
for such a system can result in a good OO system on the surface, but a real
mess of a database....
EJB's need a compliant EJB server, and a database. There are a few free
versions around - try JBoss. They work fine with Servlets/Tomcat given that
they are also part of the j2ee. I personally use Cape Connect (previosly
Orcas) with tomcat without too many problems (there are a couple of class
loader issues in some circumstances however). Orcas actually bundles Tomcat
with it, and they pre-configure it to work with their ejb container.
sam
----- Original Message -----
From: "Alexandre Bouchard" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, June 17, 2001 6:07 PM
Subject: What are EJB
> I've got a simple question: What are Enterprise Java Beans. I mean, what's
> the difference between EJB and the beans I develop with JDK and run with
> Tomcat?
>
> Thx
>
