Step-by-Step Guide to Validations in Spring Boot Starter

Introduction:

When developing a Spring Boot application that accepts user data, it’s crucial to ensure the data is secure, maintains integrity, and meets specific constraints. For example, a user’s age should be between 0 and 150 years. To handle these requirements, Spring Boot offers the spring-boot-starter-validation framework, which can validate user input and return either a success or failure response based on the input. This guide provides a simple approach to setting up and using validations in your Spring Boot applications.

Why Validations Matter

Validations help:

1. Ensure Data Integrity: Prevent incorrect data from entering the system.
2. Enhance Security: Mitigate risks of malicious data injections.
3. Improve User Experience: Provide immediate feedback to users.

Setting Up Spring Boot for Validations

To start using validations in Spring Boot, you need to include the necessary dependencies and configure your application correctly.

Step 1: Add Dependencies

Include the following dependencies in your pom.xml if you're using Maven: