[Springframework-developer] MultiActionController & Validation

[Tom N. <tom...@gm...>]

Hi spring devs --  I've got a suggestion that I'd like some help with.

I'm using the MultiActionController's binding and validation
capabilities (which by the way, I'd be glad to help there document a
little better...  )

Anyway, I'm trying to use the 'lazy' implementation, where my action
methods have the command object as the third parameter.  The problem
is, if there are validation errors, an exception is thrown (when
binder.closeNoCatch() is called on line 499 (rev 1.33).  The only way
to handle validation errors are:

1.  Don't do it the lazy way, and manually do binding/ validation
or
2.  override getExceptionHandler(Throwable exception) and create a
custom Exception handler for a ServletRequestBindingException.

Both of these could get tedious, so I'm wondering if we could make an
extension point, maybe call it handleValidationError(...) and call it
at the end of MultiActionController.bind(...) if there are validation
errors.  The default implementation could then call
binder.closeNoCatch().

Then the problem becomes, we'd normally want to return to the previous
view and display form errors....  That's where my idea fails.  Does
anyone else see this as an opportunity for enhancement?  I was going
to post an issue on JIRA, but I wanted to get others' input first.

Thanks!
-Tom