Spring Boot Validations Explained | @Valid, Annotations & Custom Validation

Published: 26 September 2025
on channel: The Curious Coder

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Java Spring Boot Interview Q29 !!

In this video, we dive deep into Spring Boot Validation with a practical REST API example. You’ll learn how to validate a user creation request using powerful validation annotations such as:

@NotNull, @NotBlank, @NotEmpty, @Size, @Email, @Pattern, @Min, @Max, @Positive, @Negative, @Digits, @Past, @Future, and the @Valid annotation in Spring Boot.

We’ll also cover:

1) Request validation in Spring Boot REST APIs
2) Using @Valid and @Validated annotations correctly
3) Handling validation errors with a Global Exception Handler (@RestControllerAdvice)
4) The complete step-by-step process of creating your own custom annotation for validation
5) How to apply the custom annotation in real-world REST API scenarios
6) Best practices for building production-ready Spring Boot applications with validations

This is a complete Spring Boot validation tutorial — from built-in annotations to creating and using custom validators — with code examples you can apply directly in your projects.

00:00 : Introduction
01:17 : Validation Without Annotations
03:36 : @NotNull Annotation
05:50 : Global Exception Handler
11:53 : @NotEmpty Annotation
14:06 : @NotBlank Annotation
15:54 : @Size Annotation
17:33 : @Min and @Max Annotation
19:15 : @Positive and @Negative Annotation
20:42 : @Digits Annotation
23:15 : @Email Annotation
25:54 : @Pattern Annotation
30:28 : Create Custom Validations

Global Exception Handler explained :
   • Global Exception Handler explained : Java ...

Spring Boot Basics to Know :

1. Spring Boot and Java Setup
   • Spring Boot and Java Setup

2. Project Object Model File | Understanding pom.xml
   • Project Object Model File | Understanding ...

3. How to create an API ?
   • How to create an API ?

4. How to Connect Spring Boot to a Database ?
   • How to Connect Spring Boot to a Database ?

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