[Springframework-developer] =?iso-8859-1?Q?Re:[Springframework-developer]_MVC_Forms?=

[=?iso-8859-1?Q?<jp....@ti...>]

Hello,=0D=0A=0D=0AStruts allows also to use the token programmatically wi=
th setToken(), isTokenValid() and so on. I had implemented such a behavio=
r to prevent resubmitting. But the solution asks mandatory the use of a m=
anually putted token field in the form as Struts handle this beyond the s=
cene. A much more general solution has to be found, but it's an effective=
 issue we have to care with.=0D=0A=0D=0AJean-Pierre=0D=0A=0D=0A=0D=0A----=
------ Initial Header -----------=0D=0A=0D=0AFrom      : springframework-=
dev...@li...=0D=0ATo          : "j=FCrgen h=F6ll=
er [werk3AT]"<jue...@we...>=0D=0ACc          : 'spring-dev=
-list' <spr...@li...>=0D=0ADate      :=
 Tue, 20 May 2003 09:36:40 -0500=0D=0ASubject : [Springframework-develope=
r] MVC Forms=0D=0A=0D=0AJuergen,=0D=0A=0D=0AThere is a problem in my vers=
ion 1 prototype of the petclinic demo.=0D=0A=0D=0AShould a user change an=
 owner's info and then use the Back button and =0D=0Atry and resubmit the=
 form (which has sessionForm=3D=3Dtrue) to make another =0D=0Achange, the=
 method AbstractFormController.handleRequestInternal will =0D=0Acall user=
Object to retrieve the form object from the session. Since the =0D=0Aform=
 object is no longer there, this results in a ServletException. My =0D=0A=
current working version works around this by overriding isFormSubmission =
=0D=0Awhich only returns true if the method was POST and it can find the =
form =0D=0Aobject. Since I have also overriden formBackingObject to provi=
de the =0D=0Aowner info in the first place, this results in a redisplay o=
f the form =0D=0Awith the user's latest changes silently ignored. This pr=
ocess must seem =0D=0Aunreasonable to users who know nothing about the pr=
oblems enterprise =0D=0Aapplication developers face with the browser's Ba=
ck button. Maybe I'm =0D=0Agoing about this wrong.=0D=0A=0D=0AThis also b=
rings up the issue of when a developer specifically wants to =0D=0Aforbid=
 resubmission as in a purchase transaction. Struts provides =0D=0Asupport=
 for a synchronizing token to prevent duplicate submissions using =0D=0At=
he <html:form> tag.=0D=0A=0D=0APerhaps we should provide some infrastruct=
ure to help developers solve =0D=0Athese problems in a consistent way.=0D=
=0A=0D=0AI am also a little bit concerned over the process used in =0D=0A=
AbstractFormController and SimpleFormController. Developers may see this =
=0D=0Aas too restrictive, especially if they are used to the flexible =0D=
=0Aforwarding strategy of Struts.=0D=0A=0D=0AWhat are your thoughts on th=
is ?=0D=0A=0D=0AKen=0D=0A =0D=0A=0D=0A=0D=0A=0D=0A-----------------------=
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