>>> "Nevarez, Benjamin" <[EMAIL PROTECTED]> 14-May-01
11:32:43 PM >>>
>Sun recommends several components for different
>kind of applications:
>1. Basic JSP and servlets
>2. JSP Pages with modular components (servlets,
> JavaBeans or custom tags)
>3. JSP Pages with modular components and EJBs
> (same as before plus EJBs)
>As you go from 1 to 3 there is an increment in Complexity
>but also in Robustness.
So they say. Robustness is hard to measure. Though I certainly can
measure the cost in dollars of moving from 2 to 3 /8->
Sun technologies aren't the only way to deal with this stuff... I've
got a lot of time for things like Cocoon which IMHO make the
separation of code and display much clearer than JSP ever does.
>Can you imagine a web designer working with complex
>servlets to change the user interface? You can for example
>just update the presentation, in this case JSPs, without
>modifying the controller or the business rules.
Yes. But you can do all of that without using EJBs. EJBs don't
provide anything in terms of clarifying program structure - IMHO they
muddy the water with the need for several different objects to
represent a single entity.
What you get with EJBs can actually be a lot clearer with a well
designed object API.
What I'm trying to get over here is that it's bad to be slavish to
the latest thing. The EJB paradigm has advantages... but it has
disadvantages too and it's not the only option for scalability and
robustness.
In my view EJBs are an excellent way of building an app really
quickly. Probably faster than you could build it any other way. But
there is a cost associated with the dynamism and it's a cost you can
reduce by rebuilding outside of the EJB environment.
Nic
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