Re: form bean and session attribute

Lew <>
Thu, 7 May 2009 13:32:23 -0700 (PDT)
On May 7, 2:16 pm, "John B. Matthews" <nos...@nospam.invalid> wrote:

In article

 Thufir <> wrote:

On May 4, 6:09 pm, "John B. Matthews" <nos...@nospam.invalid> wrote:

It's possible to write web applications with no MVC architecture at a=


They are difficult to maintain, more difficult to grow, and most
difficult to redecorate.

Well, then it appears that JSP setProperty includes a pointless
option, if using <jsp:setProperty name="bean" property="*"/> leads =


a MVC violation however you handle the result. This contradicts my
assumption that JSP setProperty conforms/facilitates MVC.

I wouldn't call it a violation. IIUC, using setProperty in the JSP is
common to a Model 1 web tier architecture, while Model 2 reserves this
to a controlling servlet. The former isn't wrong, but the latter has
some distinct advantages. See section 4.4.1 Structuring the Web Tier:


The Marty Hall slideshow about MVC recommended upthread (14-MVC.pdf,
suggests that with a Model 2 approach:

The JSP page should not create the objects
=96 The servlet, not the JSP page, should create all the data
objects. So, to guarantee that the JSP page will not create
objects, you should use
  <jsp:useBean ... type="package.Class" />
instead of
  <jsp:useBean ... class="package.Class" />

The JSP page should not modify the objects
=96 So, you should use jsp:getProperty but not jsp:setProperty.


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