title: Spring SimpleFormController, Showing error msg on the formView
body: <p>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.</p>
  
  <p>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 message.</p>
  
  <p>So please share me on how to make this happen?</p>
  
  <p>dara kok</p>