I have a simple Spring 3 MVC form using jsp taglibs. I need to add a class based on whether a field within the form has any errors associated with it or not. Here is a snipet
Did you try
<%@ taglib prefix="spring" uri="http://www.springframework.org/tags"%>
Edit after comments:
Inside tag there is errors variable (see Errors interface) bound to actual binding errors. You can check if field has errors via errors.hasFieldErrors(fieldName).
And really obscure way to get field errors without any tag is requestScope['org.springframework.validation.BindingResult.yourCommandName'].hasFieldErrors('username')...