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When the user's input is validated on the server-side, we don't usually want to stop to the first error. Instead, we want to validate all the inputs and send back a list of the parameters that are invalid. In order to do that, we need an object that keeps track of the errors.

Here's an example of that object:

	public class ErrorNotification {

		private List<String> errors = new ArrayList<>();

		public void add(String message) { 
			errors.add(message); 
		}
		
		public boolean isEmpty() {
			return errors.isEmpty();
		}

		public String toString() {
			return errors.stream()
				.collect(Collectors.joining(", "));
		}
	}

Here's a snippet of code that shows how the notification object is actually used:

	ErrorNotification errorObj = validator.validate(request);

	if (errorObj.isEmpty())
		// Notify the client about the errors