Spring Bean Validation - JSR-303 Annotations - GeeksforGeeks

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. 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. The JSR 303 bean validation annotations are defined as part of the javax.validation package. Some important Validation Annotations are defined below: Example: Example: It is also applied to strings, collections, and arrays. Example: Example: Example: Example: Example: Example: Example: Example: Example: Example: Note: For dependency use this, URL Maven Repository: https://mvnrepository.com/artifact/javax.validation/validation-api Gradle: XML configuration in pom.xml file as shown below: Here , we are using POSTMAN for Testing the application. P