ocristian/java-microservices-examples

Java Microservices: Spring Boot, Spring Cloud, JHipster, Spring Cloud Config, and Spring Cloud Gateway

Java Microservices with Spring Boot and Spring Cloud 🍃☁️

This repository contains examples of how to build a Java microservices architecture with Spring Boot 2.1, Spring Cloud Greenwich, and Netflix Eureka.

This repository has three examples in it. The first is a bare-bones microservices architecture with Spring Boot, Spring Cloud, Eureka Server, and Zuul. The second is one that's built with JHipster and configured centrally with Spring Cloud Config. The third uses Spring Cloud Gateway and Spring WebFlux to show reactive microservices.

We think you'll enjoy them both!

• See Java Microservices with Spring Boot and Spring Cloud for an overview of the first example.
• Read Java Microservices with Spring Cloud Config and JHipster to learn about microservices with JHipster.
• Refer to Secure Reactive Microservices with Spring Cloud Gateway to learn about Spring Cloud Gateway and reactive microservices.

Prerequisites: Java 11 and an internet connection.

• Spring Boot + Spring Cloud Example
• JHipster + Spring Cloud Config Example
• Spring Cloud Gateway Example
• Links
• Help
• License

Spring Boot + Spring Cloud Example

To install this example, run the following commands:

git clone https://github.com/oktadeveloper/java-microservices-examples.git
cd java-microservices-examples/spring-boot+cloud

The api-gateway and car-service projects are already pre-configured to be locked down with OAuth 2.0 and Okta. That means if you try to run them, you won't be able to login until you create an account, and an application in it.

Create a Web Application in Okta

Log in to your Okta Developer account (or sign up if you don't have an account).

1. From the Applications page, choose Add Application.
2. On the Create New Application page, select Web.
3. Give your app a memorable name, add http://localhost:8080/login/oauth2/code/okta as a Login redirect URI, select Refresh Token (in addition to Authorization Code), and click Done.

Copy the issuer (found under API > Authorization Servers), client ID, and client secret into the application.properties of the api-gateway and car-service projects.

okta.oauth2.issuer=https://{yourOktaDomain}/oauth2/default
okta.oauth2.client-id=$clientId
okta.oauth2.client-secret=$clientSecret

Then, run all the projects with ./mvnw in separate terminal windows. You should be able to navigate to http://localhost:8761 and see the apps have been registered with Eureka.

Then, navigate to http://localhost:8080/cool-cars in your browser, log in with Okta, and see the resulting JSON.

JHipster + Spring Cloud Config Example

To install this example, run the following commands:

git clone https://github.com/oktadeveloper/java-microservices-examples.git
cd java-microservices-examples/jhipster

Create Docker containers for all gateway and microservice applications:

mvn -Pprod verify com.google.cloud.tools:jib-maven-plugin:dockerBuild

Create a Web Application in Okta

Log in to your Okta Developer account (or sign up if you don't have an account).

1. From the Applications page, choose Add Application.
2. On the Create New Application page, select Web.
3. Give your app a memorable name, add http://localhost:8080/login/oauth2/code/okta as a Login redirect URI, select Refresh Token (in addition to Authorization Code), and click Done.
4. To configure Logout to work in JHipster, Edit your app, add http://localhost:8080 as a Logout redirect URI, then click Save.

Rather than modifying each of your apps for Okta, you can use Spring Cloud Config in JHipster Registry to do it. Open docker-compose/central-server-config/application.yml and add your Okta settings.

The client ID and secret are available on your app settings page. You can find the issuer under API > Authorization Servers.

spring:
  security:
    oauth2:
      client:
        provider:
          oidc:
            issuer-uri: https://{yourOktaDomain}/oauth2/default
        registration:
          oidc:
            client-id: {yourClientId}
            client-secret: {yourClientSecret}

The registry, gateway, blog, and store applications are all configured to read this configuration on startup.

Start all your containers from the docker-compose directory:

docker-compose up -d

Before you can log in to the registry, you'll need to add redirect URIs for JHipster Registry, ensure your user is in a ROLE_ADMIN group and that groups are included in the ID token.

Log in to your Okta dashboard, edit your OIDC app, and add the following Login redirect URI:

• http://localhost:8761/login/oauth2/code/oidc

You'll also need to add a Logout redirect URI:

• http://localhost:8761

Then, click Save.

Create Groups and Add Them as Claims to the ID Token

JHipster is configured by default to work with two types of users: administrators and users. Keycloak is configured with users and groups automatically, but you need to do some one-time configuration for your Okta organization.

Create a ROLE_ADMIN group (Users > Groups > Add Group) and add your user to it. Navigate to API > Authorization Servers, and click on the the default server. Click the Claims tab and Add Claim. Name it groups, and include it in the ID Token. Set the value type to Groups and set the filter to be a Regex of .*. Click Create.

Now when you hit http://localhost:8761 or http://localhost:8080, you should be able to log in with Okta!

Spring Cloud Gateway Example

To install this example, run the following commands:

git clone https://github.com/oktadeveloper/java-microservices-examples.git
cd java-microservices-examples/spring-cloud-gateway

The api-gateway and car-service projects are already pre-configured to be locked down with OAuth 2.0 and Okta. That means if you try to run them, you won't be able to login until you create an account, and an application in it.

If you already have an Okta account, see the Create a Web Application in Okta section below. Otherwise, we created a Maven plugin that configures a free Okta developer account + an OIDC app (in under a minute!).

To use it, run ./mvnw com.okta:okta-maven-plugin:setup to create an account and configure the gateway to work with Okta.

Copy the okta.* properties from the gateway's src/main/resources/application.properties to the same file in the car-service project.

Then, run all the projects with ./mvnw in separate terminal windows. You should be able to navigate to http://localhost:8761 and see the apps have been registered with Eureka.

Then, navigate to http://localhost:8080/cars in your browser, log in with Okta, and see the resulting JSON.

Create a Web Application in Okta

Log in to your Okta Developer account (or sign up if you don't have an account).

1. From the Applications page, choose Add Application.
2. On the Create New Application page, select Web.
3. Give your app a memorable name, add http://localhost:8080/login/oauth2/code/okta as a Login redirect URI and click Done.

Copy the issuer (found under API > Authorization Servers), client ID, and client secret into the application.properties of the api-gateway and car-service projects.

okta.oauth2.issuer=https://{yourOktaDomain}/oauth2/default
okta.oauth2.client-id=$clientId
okta.oauth2.client-secret=$clientSecret

Links

These examples uses the following open source libraries:

• Okta Spring Boot Starter
• Spring Boot
• Spring Cloud
• Spring Cloud Gateway
• Spring Security
• JHipster
• OpenJDK

Help

Please post any questions as comments on the example's blog post, or on the Okta Developer Forums.

License

Apache 2.0, see LICENSE.