Search Users with Keycloak in Java

06 May 2023 Balmiki Mandal 0 Core Java

Searching for Keycloak Users with Java

The Keycloak identity and access management service provides powerful authentication options for web and mobile applications. It also offers a comprehensive user management system, where users can be searched by attributes like username and email address. In this tutorial, we'll discuss how to search for users in Keycloak using Java.

Prerequisites

Before we dive into the tutorial, let's review a few prerequisites you'll need:

  • Java 8 or higher installed
  • A Keycloak instance running
  • An existing user in your Keycloak database

Creating a Java Project

To get started, create a new Java project in your favorite IDE. Make sure you're using a version of Java that is compatible with your Keycloak server. Once your project is created, it's time to add the necessary jar files to it.

Adding Keycloak Dependencies

In order to communicate with your Keycloak server, you'll need to download the Keycloak CLIENT Adapter from the official website. The downloaded file contains multiple jar files that are required for establishing a secure connection between your application and the Keycloak server. Once you have the jar files, add them to your project's classpath.

Connecting to the Keycloak Server

Now that we have the necessary dependencies in place, let's move on to the next step: connecting to the Keycloak server. To do this, we'll be using the Keycloak REST API. We'll need to provide the URL of the Keycloak server, along with a valid Access Token. Once you have the Access Token, create a Keycloak object and configure it to use the correct Keycloak credentials.

Searching for Users

Now that we have successfully authenticated, we can start searching for users. To do this, we'll be using the Keycloak Users API. This API allows us to query Keycloak for users based on various criteria, such as username and email address. You can simply pass the query parameters to the queryUsers() method, and it will return an array of users that match your criteria.

Conclusion

In this tutorial, we discussed how to search for users in Keycloak using Java. We first discussed the prerequisites for the project, then walked through the process of connecting to Keycloak and searching for users. With the help of this guide, you should now be able to easily search for users within your Keycloak application.

BY: Balmiki Mandal

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