Spring Boot 3 and Spring Security 6 Example with JWT

In this article, we are going to create a REST API-based Spring Boot application to demonstrate the use of Spring Boot 3, Spring Security 6, and the latest version of JWT. The app will have a login endpoint which accepts username/password for login and generates a JWT based token after a successful authentication. The login process will be role based and configurable in the database. We will be using MYSQL database and Spring JPA for this demo application to read all user related infos and only authorised user will be able to access the secured REST APIs.

The initial project structure is generated from https://start.spring.io by selecting maven based Spring Boot version as 3.2.4 and Java 17.

The project structure has a classic Spring Boot project structure where we have all security related configuration in config package and corresponding packages for controller, service, model classes implementation. The MYSQL configuration resides in application.proprties file.

Now, let us see the APIs that we are exposing to create this sample example app. There are 2 APIs developed here - one is for login which doesn't require any authentication for access whereas we have another API in UserController.java which is a secured API.

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