There seems to be some confusion as to the meaning of "pre-action" here.
Most of the time, when someone refers to "pre-action," they mean you hit
an ActionBean, which then forwards to a JSP. In that case, the
ActionBean is available to the JSP in the request scope and can be
accessed with ${actionBean}.
What you're describing is exactly the opposite: you hit the JSP
directly, and a form contained therein submits to an ActionBean. In this
case, there is no ActionBean associated with the request. If you need an
ActionBean instance, then you can instantiate it with s:useActionBean.
Most of the time, if you're just generating a form, you don't need the
ActionBean instance. Input defaults can be set using the "value"
attribute of the input tags. I don't understand how this is a problem.
The s:useActionBean provides several capabilities other than just
instantiating the bean, too. You can enable or disable binding, enable
or disable validation, have it execute a given event handler, have it
execute the event even if the the ActionBean has already been
instantiated for this request (which it does not do by default), and
even execute the Resolution returned from the event handler. It would be
silly and superfluous to duplicate all that in s:form.
In any case, the general consensus among Stripes users now is that the
pre-action pattern (as described in paragraph 1) should be preferred
over direct access to JSPs. There are still times when one needs to
instantiate ActionBeans from within a JSP, and that's when
s:useActionBean is useful.
-Ben
Phil Sladen wrote:
> I have been recommending Stripes to a friend on mine, but unfortunately he
> immediately stumbled upon the issue that you have to have to explicitly make
> a call to UseActionBean to use your actionbean in a pre-action JSP. Please
> can someone explain why the bean shouldn't be available by default. Thanks.
>
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