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From "Robert Taylor" <>
Subject RE: Newbie: java.lang.boolean and DynaActionForm?
Date Wed, 17 Dec 2003 15:27:11 GMT
To address the "fundemental" question, it is considered a "best practice"
to only use String or Boolean objects or collections of String and/or
Boolean objects or collection of
data structures which contain String and/or Boolean objects in your forms.
This is because it gives you
more control over validation. This doesn't mean that DynaActionForms or
any DynaXXXXForm for that matter doesn't support non-string types. It
any Object because essentially the DynaXXXForms internal data structure is a

In general the Struts form should be a ValueObject passing immutable data
from the input
to be processed or passing immutable data to the output to be rendered.

The great thing about Struts is that it gives you more than enough "rope" to
use wisely or hang yourself :)


> -----Original Message-----
> From: Engbers, ir. J.B.O.M. []
> Sent: Wednesday, December 17, 2003 9:24 AM
> To: ''
> Subject: Newbie: java.lang.boolean and DynaActionForm?
> Hi,
> Both 'Struts in Action' and 'Programming Jakarta Struts' state that
> ActionForms and DynaActionForms are nearly equivalent and the
> main advantage
> of using DynaActionForms is that you don't have to declare all the getters
> and setters.
> In DynaAction Forms each property can be of a (array of a)
> primitive types.
> Thanks to Pedro Salgado and Martin Gainty (see "Retrieving boolean
> properties from a DynaActionForm" on december 16), I partially
> succeeded in
> solving the first problem which only confronted me with the next
> problem :-(
> And while looking for a solution to that problem, I found a bugreport
> (23355) in which Craig states that
> 'Adding these (getInteger, getBoolean etc, Ben) would encourage a behavior
> that Struts discourages -- using
> non-String data types in a form bean.'
> Maybe that this explains why I have only found examples that use
> String-properties (which lead me to my first question: where can I find
> examples that use non_string properties?) but it leaves me with the more
> fundamental question:
> Why do DynaActionForms offer the possibility to declare non-String
> properties without supporting them?
> Should I avoid using DynaActionForms at all and use the DynaValidatorForm?
> Ben Engbers
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