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Create a Java Application With Apache Kafka
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Create a Java Application With Apache Kafka

This example shows how to use Okta's Authentication API with Java integrating with Kafka.

Please read Kafka with Java: Build a Secure, Scalable Messaging App for a tutorial that shows you how to build this application.


Okta has Authentication and User Management APIs that reduce development time with instant-on, scalable user infrastructure. Okta's intuitive API and expert support make it easy for developers to authenticate, manage and secure users and roles in any application.

Getting Started

To install this example application, run the following commands:

git clone

This will get a copy of the project locally.

Create a Free Okta Developer Account

If you don't have one, create an Okta Developer account. After you've completed the setup process, you'll need to log in and create a new application.

  • Go to Applications > Add Application
  • Select Web and click Next
  • Fill in the following options in the form:
    • Name: Bootiful Kafka
    • Base URIs: http://localhost:8080
    • Login redirect URLs: http://localhost:8080/login/oauth2/code/okta
  • Click Done

Copy and paste your client ID and secret into src/main/resources/

okta.oauth2.issuer: https://{yourOktaDomain}/oauth2/default  
okta.oauth2.client-id: {yourClientID}
okta.oauth2.client-secret: {yourClientSecret}

The value for {yourOktaDomain} can be found in the top right corner of your Okta Dashboard, it will look something like:

IMPORTANT: This file should only be used locally. Do not commit your client's secret to Git or any other Version Control System.

To avoid accidentally exposing these credentials, you can also specify your Okta application's values as environment variables. Create an okta.env file in the root directory of your app with the following environment variables. Then run source okta.env before starting your app.

export OKTA_OAUTH2_ISSUER=https://{yourOktaDomain}/oauth2/default
export OKTA_OAUTH2_CLIENT_ID={yourClientID}
export OKTA_OAUTH2_CLIENT_SECRET={yourClientSecret}

Start the application

To start the application you can run:

./mvnw spring-boot:run

Navigate to http://localhost:8080 to authenticate with Okta! If you don't see a login screen, it's likely because you're already logged in. Try it in an incognito window to see the OAuth 2.0 code flow in action.


This example uses the following libraries provided by Okta:


Please post any questions as comments on this blog post, or visit our Okta Developer Forums. You can also email if would like to create a support ticket.


Apache 2.0, see LICENSE.

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