Spring MVC Beginner’s Guide

Time for action – adding custom validation support

In this section, you will learn how to create custom validation annotations and use them. Add a custom product ID validation to your add product page to validate duplicate product IDs by performing the following steps:

1. Create an annotation interface called ProductId (ProductId.java) under the package com.packt.webstore.validator in the source folder src/main/java. Then, add the following code snippet in it:

   package com.packt.webstore.validator; import static java.lang.annotation.ElementType.ANNOTATION_TYPE; import static java.lang.annotation.ElementType.FIELD; import static java.lang.annotation.ElementType.METHOD; import static java.lang.annotation.RetentionPolicy.RUNTIME; import java.lang.annotation.Documented; ...