Spring SimpleFormController, Showing error msg on the formView

I'm using Spring SimpleFormController to handle a form submission with validation. I expect a case where an exception will occur inside my "onSubmit" method. In such a case, i want the user to see the original formView with all the data filled in plus the error message from the exception.

I've checked around, i see people recommend a class from Spring like *ExceptionMapper which it can forward user to a page with friendly error mess开发者_开发技巧age.

So please share me on how to make this happen?

dara kok

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If you are using SimpleFormController and onSubmit, you are probably not using Spring annotations and related features. You could do something like the following in your controller. In your client-side, you can use the contents of error object to display errors, along with the form. Note that onSubmit() and showForm() are deprecated in spring 3.0.

@Override
protected ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse
        response, Object command,   BindException errors) throws Exception {
        // Do your processing
        if (somethingWentWrong) {
            errors.reject("error.server.error");
            return showForm(request, response, errors);
        } else {
           return new ModelAndView(getSuccessView());
        }
}