What is Bean Validation?

Bean validation in Spring Boot is the most important tool for ensuring that data entering your application is valid and meets your specific requirements. It is based on the JSR-303 Bean Validation specification, which standardizes how beans can be validated in Java. The main use-case of bean validation in spring boot is to allow defining data integrity rules for Java objects. This ensures objects meet requirements before usage.

Benefits of Using Spring Bean Validation and JSR-303 Annotations for Data Validation

• Improved Data Integrity: Ensures that data entering your application is valid and consistent, reducing errors and inconsistencies.
• Improved Code Readability and Maintainability: Declarative annotations and automatic validation make code more readable and easier to manage.
• Reduced Development Time: Simplifies data validation tasks, allowing developers to focus on core application logic.
• Standardized Approach to Data Validation: Standardized approach across all Java EE platforms via JSR-303. Validations are portable and can be reused.

In this article, we’ll explore practical examples of how to apply JSR-303 annotations to your domain objects from basic annotations to advanced. So basically annotations provide a declarative way to configure Spring beans, manage dependencies, and define behaviors, reducing the need for boilerplate code and making your code more concise and expressive.