Rickard Öberg wrote:
> > > 3 Don't generate any stubs (EJBoss)
> > >
> > > The main difference is in administration, and should be hardest with 1
> > > and easiest with 3.
> >
> > The use of java.lang.reflect.Proxy (or "no stubs") in EJBoss is really nice but
> > as I understand it you still need to dynamically or manually load the proxy
> > handlers to communicate back to the server. The java.lang.reflect.Proxy provides
> > you with a dynamic proxy generation on the client VM (providing your using JDK
> > 1.3) but it doesn't eliminate the need for an InvocationHandler that smart
> > enough to connect to the server and handle things like transaction propagation
> > and communication of method invocations. Of course, I'm basing my assessment on
> > EJBoss model from a few months ago and this may have changed. If not, I don't
> > think your use of java.lang.reflect.Proxy buys you much.
>
> Yes, but this is a "oneshot" thing which never changes. If you have an
> application that uses EJBoss you bundle ejbossclient.jar with it, and
> then it will be able to call all EJB's in any EJBoss server without any
> need for dynamic class downloading. So I would say that the gain is big.
> There's also no issues with managaing the actual stub files on the
> server, and they're generated very fast which is good for development
> (your typical stub generation tool takes awhile to do this, whereas
> dynamic proxy generation takes about a second).
>
That's a very good point. Its a nice feature and it will be more valuable to customers
when the JDK 1.3 is out of beta and is actually used as a production VM. For now
however, I don't think its such a good idea because it only works in JDK 1.3 and no
one is using JDK 1.3 in production -- in fact, many are still using JDK 1.1!
I commend Magnus Stenman of Orion who originally invented the idea of using the new
Proxy class for auto generating stubs on the client (Give credit where credit is
due). Actually, as Magnus pointed out once, credit also goes to Object Space's
Voyager team who were the first to do something like this using a custom VM a couple
of years ago. Object Space is a true innovator.
Richard
--
Author of Enterprise JavaBeans
Published by O'Reilly & Associates
http://www.EjbNow.com
EJB FAQ
http://www.jguru.com/faq/EJB
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