Per my understanding of EJB, it is highly undesirable for client to
communicate directly to the entity bean. It is preferrable whenever possible
to use session beans (stateless if possible) that will hold the connection
with entity beans. You can say you are using Mediator pattern to achieve
ultimate decoupling and utilize the best performance in component driven
environment.
Re. EJB server. I liked Voyager and WebLogic. WebLogic is easier to use and
it supports EJB 1.1 and JSP and can serve also as Web server or as a
secondary Web server chained to the primary Web server for performing
specific servlet based tasks.
Voyager has an advantage that it allows for transparent CORBA and DCOM
client access to your EJB. I liked their architecture and services better
but they are alittle behind in standards support (they are current as of
this writing on EJB 1.0 and Corba 2.2). I found Voyager a little more
difficult to use a well.
You can download both for 30 days of your purpose is to learn.
Re. free one. There is free source project www.ejboss.org but I do not think
they have a product anybody can use (maybe I am wrong).
Vadim.
-----Original Message-----
From: Kenneth D. Litwak [mailto:[EMAIL PROTECTED]]
Sent: Thursday, October 21, 1999 1:11 PM
To: [EMAIL PROTECTED]; [EMAIL PROTECTED];
[EMAIL PROTECTED]; [EMAIL PROTECTED]
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: RE: Help : EJB invoked in an applet.Some Doubts....
I didn't follow the start of this thread, but I'd like to make a
suggestin if
it's relevant. I caught the end of a very good EJB presentation at JavaOne
last
June and the speaker said thatfor performance reasons, you wouldnot want an
applet to directly interact with an EJB. Using a pieceof middleware would
be
much more effecient thanpassing entity bean info backa nd forth from EJB
server
to client and back again. Plus, of course, the less coupled the client
(whatever it is) is to a specific middle tierimplementation, the better.
That's
not because I dislike EJBs. I think they're a great idea. It's simply an
issue
of code maintenance. I'd always vote for a client sending a command object
to a
tier twoprogram to ask it to do work on the client's behalf. Just my $.02.
Ken
>
>Hi All,
>
> you can use Visual Cafe to create the jar packager. you add the
class,
and it creates the jar with all the classes it uses. but i think you wont
like
to buy it only for this... :((
>
> i'm starting to study EJB. what EJB host are you using?
>
> you says that the files needed in a applet are very large. about
what
size are them?
>
> thanks,
>
> guich.
>
>
>
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