![]() We’re going to implement the custom validator class in a minute. We use it to declare a class that will contain actual validation logic. ![]() Let’s start with the validatedBy attribute. It actually marks our annotation for use as a validation constraint. Explaining annotationįor you, the most interesting part is the annotation. If so, Java can read it with the reflection mechanism. The annotation describes if the custom annotation should be available in the byte code. Why? Because constrains can be declared on fields, constructor parameters, and setters. In our case, we allow using for class fields and methods. The annotation describes where you can apply your custom annotation. If you see them for the firs time, no worries. ![]() If you have ever created a custom annotation, and shouldn’t be new to you. Our custom annotation is itself annotated with three other annotations. Our goal in this tutorial is to validate login uniqueness that the client of the service will class UserController " Presented samples works both in Spring Boot 1.x and 2.x Advertisement Setup of study caseįirst of all, we need a sample problem that we can solve together.įor demonstration purpose, let’s consider a REST endpoint which will allow registration for new users of some application. You will also see how to use Spring beans inside a custom validator. Creating a custom validation annotation is pretty easy. In this post, you will learn how to create a custom constraint annotation and a corresponding validator class. Since you’re here, you probably reach the point in which standard annotations like or don’t meet your expectations.
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