jwt spring security demo

A demo for using JWT (Json Web Token) with Spring Security and Spring Boot 2

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Java

JWT Spring Security Demo

Screenshot from running application

About

This is a demo for using JWT (JSON Web Token) with Spring Security and
Spring Boot. I completely rewrote my first version. Now this solution is based on the code base
from the JHipster Project. I tried to extract the minimal configuration and classes that are needed
for JWT-Authentication and did some changes.

Requirements

This demo is build with with Maven 3.6.x and Java 11.

Usage

Just start the application with the Spring Boot maven plugin (mvn spring-boot:run). The application is
running at http://localhost:8080.

You can use the H2-Console for exploring the database under http://localhost:8080/h2-console:

Screenshot from h2-console login

Backend

There are three user accounts present to demonstrate the different levels of access to the endpoints in
the API and the different authorization exceptions:

Admin - admin:admin
User - user:password
Disabled - disabled:password (this user is deactivated)

There are four endpoints that are reasonable for the demo:

/api/authenticate - authentication endpoint with unrestricted access
/api/user - returns detail information for an authenticated user (a valid JWT token must be present in the request header)
/api/persons - an example endpoint that is restricted to authorized users with the authority 'ROLE_USER' (a valid JWT token must be present in the request header)
/api/hiddenmessage - an example endpoint that is restricted to authorized users with the authority 'ROLE_ADMIN' (a valid JWT token must be present in the request header)

Frontend

I’ve written a small Javascript client and put some comments in the code that hopefully makes this demo understandable.
You can find it at /src/main/resources/static/js/client.js.

Generating password hashes for new users

I’m using bcrypt to encode passwords. Your can generate your hashes with this simple
tool: Bcrypt Generator

Using another database

Actually this demo is using an embedded H2 database that is automatically configured by Spring Boot. If you want to connect
to another database you have to specify the connection in the application.yml in the resource directory. Here is an example for a MySQL DB:

spring:
  jpa:
    hibernate:
      # possible values: validate | update | create | create-drop
      ddl-auto: create-drop
  datasource:
    url: jdbc:mysql://localhost/myDatabase
    username: myUser
    password: myPassword
    driver-class-name: com.mysql.jdbc.Driver

Hint: For other databases like MySQL sequences don’t work for ID generation. So you have to change the GenerationType in the entity beans to ‘AUTO’ or ‘IDENTITY’.

You can find a reference of all application properties here.

Using Flyway

https://github.com/szerhusenBC/jwt-spring-security-demo/issues/81

Docker

This project has a docker image. You can find it at https://hub.docker.com/r/hubae/jwt-spring-security-demo/.

Questions

If you have project related questions please take a look at the past questions or create a new ticket with your question.

If you have questions that are not directly related to this project (e.g. common questions to the Spring Framework or Spring Security etc.) please search the web or look at Stackoverflow.

Sorry for that but I’m very busy right now and don’t have much time.

Interesting projects

spring-security-pac4j a Spring Boot integration for Pac4j (a Java security engine that covers JWT beside others)
For more complex microservice environments take a look here: Using JWT with Spring Security OAuth

Author

Stephan Zerhusen

Copyright and license

The code is released under the MIT license.

Please feel free to send me some feedback or questions!