I’m not sure I understand what you are asking?

Can you clarify ?

I was able to add new rows without need of an aditional JSP nor a dedicated controller. Thanks to JSTL and javascript is easy to create a row template and replace on client side a placeholder with the row number.

However I thing my implementation could be improved, is there any way to retrieve jsp tag body without have been processed?

In this example you have a students class which has student name property.

We have a similar requirement. Here we have a dropdown which contains 4 different types of auctions. Every auction has a different set of parameters.

If I select any auction the corresponding auction parameters should get displayed.

Since every auction has different parameters like start date, end date and so on, how should I use spring bind tag to bind those parameters?

I have an auction class as my command class and it contaims AuctionParamValues as list.
The auctionParamValues is an object that contains paramname and param value.

Could you please help me with this one?

Many thanks for your comments I am glad it helped you

Cheers!

I guess in the controller submit method you could add the BindingResult parameter and implement your own validator.

You could also use the new JSR-303 Bean Annotation validation on each individual student and that should vailidate so the onSubmit method would become:

@RequestMapping(method = RequestMethod.POST, value="/processClassForm.page")
protected String onSubmit( @ModelAttribute("classCommand") @Valid ClassCommand classCommand,  ModelMap model )
{
	model.addAttribute("savedClass", classCommand);
	return "formResult.view";
}

In that case, rather than using the @ModelAttribute function you could just populate the required object (by placing into the ModelMap) in the GET annotated controller method in that case the object would be populated when and only when the form is displayed.

If you need to pre-populate the Class Command in this example such as calling into a database as you mention you can do so by all means. The AutoPopulating list of the class command can be updated in the same way as a java.util.List