Develop Custom Validators for Spring Web-app | A step by step guide to Hibernate Validator[Advanced]

Let's learn to create ANNOTATIONS to validate web forms. In this video, We will develop our custom validators.
We must aware of these concepts as there is no real-world application exists which doesn't use custom validators.

There are different ways to build custom validators. Today we will develop custom validators using the JSR 303/ 349/ 380. We will use the hibernate validators / Java bean validation API as the dependency.

Our goal is here to create some annotations like @Size, @NotNull, @NotBlank. In this video, we will create an annotation called @Age to validate the age field of our project.

Below are the contents we will be covering in this tutorial.
Video Map:
⏱️TIMESTAMPS⏱️
Introduction 00:00
Bean Validation API [remaining] : 06:09
Create Custom Annotation[Theory] : 15:05
Java Retention Policy : 21:10
Custom Validation constraint[Theory] : 29:27

The 20 Minutes Challenge: 32:56
Looking into Hibernate Validator source code
@Size/ @NotBlank Source code Analysis: 34:53
Understanding the Resource bundle: 45:16

Developing @Age annotation: 55:50
Writing a validation constraint class: 01:03:27
Implementing the logic: 01:11:24

Let's Debug: 01:30:35
An important scinario : 01:36:14

Configuring properties file with our app(Analysis) 01:39:07
Adding a properties file : 01:45:35
Implementing the MessageSource bean/ResourceBundleMessageSource : 01:48:19
Implementing LocalValidatorFactoryBean :02:01:47
Wrapping up with assignment: 02:08:35

In the next video, we will learn a different approach to create form validators. We can either use JSR 303/380 or SpringValidator interface to create a custom validator.

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