David,
Lee's comments are right on the mark. However, you should be aware that
the choice of a servlet engine and application server are not necessarily
mutually exclusive. Most application servers support EJB, load balancing,
fail-over, database connection pooling, etc., but many do *not* support
servlets or JSP (notable exceptions are BEA WebLogic, IBM WebSphere, and
GemStone/J).
You should design your web-based applications so that servlets/JSP are
restricted to implementing presentation logic (HTML generation) and do
all of the "real work" in a separate set of classes that perform database
access and implement business logic. Your business logic classes can
either be deployed with your servlets or on an application server. In the
latter case, servlets become "just another client" of the application
server.
Another way to look at it is to view servlet engines as lightweight,
inexpensive application servers. You can begin your development and
deployment on a servlet engine with a very low entry cost. You can
introduce an application server into the architecture as you being to
feel the need for the heavy-duty features they provide. At this point you
can either leave the servlet engine in place, as a client to the
application server, or you can re-deploy your servlets/JSP onto the
application server.
Vince
---------------- Begin Forwarded Message ----------------
Date: 5/25/99 3:19 PM
Received: 5/25/99 4:05 PM
From: Ackerman, Lee, [EMAIL PROTECTED]
Reply-To: A mailing list for discussion about Sun Microsystem's Java
, Se
To: [EMAIL PROTECTED]
David, I've been doing some research into this as well and some of the
differences that I've seen so far include:
- app servers provide a more sophisticated environment than a servlet
runner. Most of the app servers are either already or are going to be
supporting the entire JPE including EJB's , JNDI, JSP, Servlets, etc.
- app servers provide built-in functionality such as load balancing and
server fail-over
-app servers include database connection pooling.
- app servers have a higher purchase price - I believe that BEA's app
server
is one the less expensive servers
Lee.
> -----Original Message-----
> From: David S. Soleno [SMTP:[EMAIL PROTECTED]]
> Sent: Tuesday, May 25, 1999 11:48 AM
> To: [EMAIL PROTECTED]
> Subject: Application servers vs. servlet runners
>
> My company has assigned me the responsibility of evaluating and ranking
> the currently available commercial application servers. Can anyone
> point out for me the major differences between an application server
> like BEA WebLogic and a servlet runner like JRun?
>
> --
> David S. Soleno
> Software Engineer
> SciberNet, Inc.
> Tel: (619) 824-0840
> Fax: (619) 824-0846
> e-mail: [EMAIL PROTECTED]
>
----------------- End Forwarded Message -----------------
----------------------------------------------------------------------
Vince Bonfanti [EMAIL PROTECTED]
New Atlanta Communications, LLC http://www.newatlanta.com/
----------------------------------------------------------------------
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