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By Jim Anderson
The Okta Spring Boot Starter makes it easy to add login to your Spring Boot application.We recommend that you log in to follow this quickstart with examples configured for your account.

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Using Spring WebFlux?

This tutorial uses Spring MVC. If you are using Spring WebFlux, the steps to add authentication are similar, but some of the implementation details are different. Refer to the Spring Boot WebFlux Sample Code to see how to integrate Auth0 with your Spring Boot WebFlux application.
New to Auth? Learn How Auth0 works, how it integrates with Regular Web Applications and which protocol it uses.

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Configure Auth0

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Get Your Application Keys

When you signed up for Auth0, a new application was created for you, or you could have created a new one. You will need some details about that application to communicate with Auth0. You can get these details from the Application Settings section in the Auth0 dashboard.
App Dashboard
You need the following information:
  • Domain
  • Client ID
  • Client Secret
If you download the sample from the top of this page, these details are filled out for you.

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Configure Callback URLs

A callback URL is a URL in your application where Auth0 redirects the user after they have authenticated. The callback URL for your app must be added to the Allowed Callback URLs field in your Application Settings. If this field is not set, users will be unable to log in to the application and will get an error.
If you are following along with the sample project you downloaded from the top of this page, the callback URL you need to add to the Allowed Callback URLs field is http://localhost:3000/login/oauth2/code/okta.

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Configure Logout URLs

A logout URL is a URL in your application that Auth0 can return to after the user has been logged out of the authorization server. This is specified in the returnTo query parameter. The logout URL for your app must be added to the Allowed Logout URLs field in your Application Settings. If this field is not set, users will be unable to log out from the application and will get an error.
If you are following along with the sample project you downloaded from the top of this page, the logout URL you need to add to the Allowed Logout URLs field is http://localhost:3000/.

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Configure Spring Boot Application

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Add dependencies

To integrate your Spring Boot application with Auth0, include the Okta Spring Boot Starter in your application’s dependencies.
This guide uses Thymeleaf and the Spring Security integration module for the view layer. If you are using a different view technology, the Spring Security configuration and components remain the same.
If you’re using Gradle, you can include these dependencies as shown below. 
plugins {
    id 'java'
    id 'org.springframework.boot' version '3.1.4'
    id 'io.spring.dependency-management' version '1.1.3'
}

implementation 'com.okta.spring:okta-spring-boot-starter:3.0.5'
implementation 'org.springframework.boot:spring-boot-starter-web'
implementation 'org.springframework.boot:spring-boot-starter-thymeleaf'
implementation 'org.thymeleaf.extras:thymeleaf-extras-springsecurity6'
implementation 'nz.net.ultraq.thymeleaf:thymeleaf-layout-dialect'
If you are using Maven: 
<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>3.1.5</version>
    <relativePath/>
</parent>

<dependencies>
    <dependency>
        <groupId>com.okta</groupId>
        <artifactId>okta-spring-boot-starter</artifactId>
        <version>3.0.5</version>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-oauth2-client</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>
    <dependency>
        <groupId>org.thymeleaf.extras</groupId>
        <artifactId>thymeleaf-extras-springsecurity6</artifactId>
    </dependency>
    <dependency>
        <groupId>nz.net.ultraq.thymeleaf</groupId>
        <artifactId>thymeleaf-layout-dialect</artifactId>
    </dependency>
</dependencies>

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Configure Spring Security

The Okta Spring Boot Starter makes it easy to configure your application with Auth0. The sample below uses an application.yml file, though you can also use properties files or any of the other supported externalization mechanisms.

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Add Login to Your Application

To enable user login with Auth0, create a class that will register a SecurityFilterChain, and add the @Configuration annotation. 
package com.auth0.example;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.web.SecurityFilterChain;

import static org.springframework.security.config.Customizer.withDefaults;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

    @Bean
    public SecurityFilterChain configure(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(authorize -> authorize
                .anyRequest().authenticated()
            )
            .oauth2Login(withDefaults());
        return http.build();
    }
}
You can further configure the HttpSecurity instance to require authentication on all or certain paths. For example, to require authentication on all paths except the home page:
http
    .authorizeHttpRequests(authorize -> authorize
        .requestMatchers("/").permitAll()
        .anyRequest().authenticated()
    );
The Okta Spring Boot Starter will use the client configuration you defined earlier to handle login when a user visits the /oauth2/authorization/okta path of your application. You can use this to create a login link in your application. 
<!-- src/main/resources/templates/index.html -->
<html lang="en" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity5">
    <body>
        <div sec:authorize="!isAuthenticated()">
            <a th:href="@{/oauth2/authorization/okta}">Log In</a>
        </div>
        <div sec:authorize="isAuthenticated()">
            <p>You are logged in!</p>
        </div>
    </body>
</html>
Be sure to create or update a controller to render your view. 
package com.auth0.example;

import org.springframework.security.core.annotation.AuthenticationPrincipal;
import org.springframework.security.oauth2.core.oidc.user.OidcUser;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;

/**
 * Controller for the home page.
 */
@Controller
public class HomeController {

    @GetMapping("/")
    public String home(Model model, @AuthenticationPrincipal OidcUser principal) {
        return "index";
    }
}

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Checkpoint

Add the login link to your application. When you click it, verify that your application redirects you to the Auth0 Universal Login page and that you can now log in or sign up using a username and password or a social provider.Once that’s complete, verify that Auth0 redirects you to your application and that you are logged in.
Auth0 Universal Login
Auth0 enables the Google social provider by default on new tenants and offers you developer keys to test logging in with social identity providers. However, these developer keys have some limitations that may cause your application to behave differently. For more details on what this behavior may look like and how to fix it, consult the Test Social Connections with Auth0 Developer Keys document.

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Add Logout to Your Application

Now that users can log into your application, they need a way to log out. By default, when logout is enabled, Spring Security will log the user out of your application and clear the session. To enable successful logout of Auth0, you can provide a LogoutHandler to redirect users to your Auth0 logout endpoint (https://{yourDomain}/v2/logout) and then immediately redirect them to your application. In the SecurityConfig class, provide a LogoutHandler that redirects to the Auth0 logout endpoint, and configure the HttpSecurity to add the logout handler: 
package com.auth0.example;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.logout.LogoutHandler;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import java.io.IOException;

import static org.springframework.security.config.Customizer.withDefaults;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

    @Value("${okta.oauth2.issuer}")
    private String issuer;
    @Value("${okta.oauth2.client-id}")
    private String clientId;

    @Bean
    public SecurityFilterChain configure(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(authorize -> authorize
                .requestMatchers("/", "/images/**").permitAll()
                .anyRequest().authenticated()
            )
            .oauth2Login(withDefaults())

            // configure logout with Auth0
            .logout(logout -> logout
                .addLogoutHandler(logoutHandler()));
        return http.build();
    }

    private LogoutHandler logoutHandler() {
        return (request, response, authentication) -> {
            try {
                String baseUrl = ServletUriComponentsBuilder.fromCurrentContextPath().build().toUriString();
                response.sendRedirect(issuer + "v2/logout?client_id=" + clientId + "&returnTo=" + baseUrl);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        };
    }
}
You can then update your view to POST to the /logout endpoint (Spring Security provides this by default) to enable users to log out. 
<div sec:authorize="isAuthenticated()">
    <p>You are logged in!</p>
    <form name="logoutForm" th:action="@{/logout}" method="post">
        <button type="submit" value="Log out"/>
    </form>
</div>

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Checkpoint

Add the logout link in the view of your application. When you click it, verify that your application redirects you the address you specified as one of the “Allowed Logout URLs” in the “Settings” and that you are no longer logged in to your application.

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Show User Profile Information

You can retrieve the profile information associated with logged-in users through the OidcUser class, which can be used with the AuthenticationPrincipal annotation. In your controller, add the user’s profile information to the model: 
@Controller
public class HomeController {

    @GetMapping("/")
    public String home(Model model, @AuthenticationPrincipal OidcUser principal) {
        if (principal != null) {
            model.addAttribute("profile", principal.getClaims());
        }
        return "index";
    }
}
You can then use this profile information in your view, as shown below. 
<div sec:authorize="isAuthenticated()">
    <Frame><img th:src="${profile.get('picture')}" th:attr="alt=${profile.get('name')}"/></Frame>
    <h2 th:text="${profile.get('name')}"></h2>
    <p th:text="${profile.get('email')}"></p>
    <a th:href="@{/logout}">Log Out</a>
</div>

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Checkpoint

Verify that you can display the user name or any other user property after you have logged in.
What can you do next?
Configure other identity providersEnable multifactor authentication
Learn about attack protectionLearn about rules
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