Spring Boot 3.0 - JWT Authentication with Spring Security using MySQL Database

JWT authentication in Spring Boot 3.0 enables secure and stateless communication for REST APIs. By integrating Spring Security with JWT and MySQL, applications can efficiently handle user authentication without relying on server-side sessions. This approach improves scalability and security in modern distributed systems.

• Generates JWT tokens after successful authentication for secure API access.
• Stores user data in MySQL with encrypted passwords for security.
• Implements role-based access control to restrict endpoints based on user roles.
• Ensures stateless authentication, eliminating the need for server-side sessions.

Step-by-Step Implementation of Project

In this project, we will build a Spring Boot 3.0 application that integrates Spring Security with JWT and connects to a MySQL database for user management.

Step 1: Create a Spring Boot Project

Create a Spring Boot Project in Spring Initializr. For this project, choose the following options:

• Project: Maven
• Language: Java
• Packaging: Jar
• Java: 17

Please choose the following dependencies while creating the project.

• Spring Web
• Spring Security
• MySQL Driver
• Spring Data JPA
• Lombok

Additionally, we have added dependencies for JWT also. Below are the dependencies

<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt-api</artifactId>
<version>0.11.5</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt-impl</artifactId>
<version>0.11.5</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt-jackson</artifactId>
<version>0.11.5</version>
</dependency>

Below is the complete pom.xml file. Please cross-verify if you have missed some dependencies.

Project Structure:

Before moving to the project here is the complete project structure.

👁 Image

Step 2: Create a Controller

Go to the src -> main -> java -> controller and create a class UserController and put the below code. In this, we have created a simple REST API in our controller class.

UserController.java:

Step 3: Create a SecurityConfig Class

Go to the src -> main -> java -> config and create a class SecurityConfig and put the below code. This is the new changes brought in Spring Boot 3.0.

Step 4: Create Entity Classes

Go to the src -> main -> java -> entity and create a class UserInfo and put the below code.

Similarly, create a class AuthRequest and put the below code.

Step 5: Create Filter Class

Go to the src -> main -> java -> filter and create a class JwtAuthFilter and put the below code.

Step 6: Create a Repository Interface

Go to the src -> main -> java -> repository and create an interface UserInfoRepository and put the below code.

Step 7: Create Service Classes

Go to the src -> main -> java -> service and create a class JwtService and put the below code.

Similarly, create a class UserInfoDetails and put the below code.

Similarly, create a class UserInfoService and put the below code.

Step 8: application.properties

Make the following changes in the application.properties file:

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.url = jdbc:mysql://localhost:3306/university

spring.datasource.username = root

spring.datasource.password = 143@Arpilu

spring.jpa.hibernate.ddl-auto = update

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQLDialect

spring.jpa.hibernate.naming.physical-strategy=org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

Test the Application

Now run your application and test it out. Hit the following URL:

http://localhost:8080/auth/addNewUser

It will add the user to the database.

👁 Image

Below is our database screenshot.

👁 Image

Now, hit the following URL to generate the token.

http://localhost:8080/auth/generateToken

It will generate the token.

👁 Image

Now using this take we can access our endpoint according to the ROLE. Hit the following URL and put the Bearer token.

http://localhost:8080/auth/user/userProfile

Refer to the screenshot below.

👁 Image