ValidationAware add callable method, called from DefaultWorkflowInterceptor

When a form error occurs, the action is unaware of this event. There are situations whereby one should know that a form error has occurred. For example, one may wish to populate the ActionStack with special handling variables or set a flag denoting special logic that the JSP should handle. In short, it isn't unreasonable for one to want to know that a form error occurred and be able to respond to it with more than just a single JSP result attached to "input."

My suggestion would be within ValidationAware, add a method:
void actionError()

Within DefaultWorkflowInterceptor.doIntercept, there is already an if condition of:
if (validationAwareAction.hasErrors()) {

at the end of processing that if block, just before, "return resultName;" call validationAwareAction.actionError();

By the way, this line:
LOG.debug("Errors on action " + validationAwareAction + ", returning result name 'input'");

should be:
LOG.debug("Errors on action " + validationAwareAction + ", returning result name '" + inputResultName + "'");