Breached password detection is a critical component of secure applications.    Read the white paper

FusionAuth logo
FusionAuth logo
  • Features
    FusionAuth Reactor

    FusionAuth Reactor is a powerful suite of features developed to extend FusionAuth's core functionality.

    • Flexible Architecture   Flexible Architecture
    • Auth the Way You Want It   Auth the Way You Want It
    • Security & Compliance   Security & Compliance
    • Ultimate Password Control   Ultimate Password Control
    • Customizable User Experience   Customizable User Experience
    • Advanced Registration Forms   Advanced Registration Forms
    • Built for Devs   Built for Devs
    • User Management & Reporting   User Management & Reporting
    • Scalability   Scalability
    • Single Sign-on   Single Sign-on
    • Breached Password Detection   Breached Password Detection
    • Connectors   Connectors
    • FusionAuth Reactor   FusionAuth Reactor
  • Pricing
    Cloud Pricing

    Let us host, monitor, manage, and maintain your deployments in your own private cloud.

    SEE PRICING cloud pricing   See FusionAuth Cloud Pricing
    Editions Pricing

    A powerful set of features with available support that extends FusionAuth's core functionality.

    SEE PRICING edition pricing   See FusionAuth Edition Pricing
    Editions + Cloud

    FusionAuth will handle everything so you can get back to building something awesome.

    GET STARTED Get started
  • Docs
  • Downloads
  • Resources
    FusionAuth Resources
    • Upgrade from SaaS
    • Upgrade from Open Source
    • Upgrade from Home Grown
    • Blog   Blog
    • Forum   Forum
    • Community & Support   Community & Support
    • Customer & Partners   Customers & Partners
    • Video & Podcasts   Videos & Podcasts
    • Getting Started   Getting Started
  • Expert Advice
    Expert Advice for Developers

    Learn everything you need to know about authentication, authorization, identity, and access management from our team of industry experts.

    • Authentication   Authentication
    • CIAM   CIAM
    • Identity Basics   Identity Basics
    • OAuth   OAuth
    • Security   Security
    • Tokens   Tokens
    • Dev Tools   Dev Tools
  • Account
Navigate to...
  • Welcome
  • Getting Started
  • 5-Minute Setup Guide
  • Reactor
  • Core Concepts
    • Overview
    • Users
    • Roles
    • Groups
    • Registrations
    • Applications
    • Tenants
    • Identity Providers
    • Authentication and Authorization
    • Integration Points
    • Roadmap
  • Installation Guide
    • Overview
    • System Requirements
    • Server Layout
    • Cluster
    • Docker
    • Fast Path
    • Kickstart™
    • Homebrew
    • Packages
    • Database
    • FusionAuth App
    • FusionAuth Search
    • Securing
    • Upgrading
  • APIs
    • Overview
    • Authentication
    • Errors
    • Actioning Users
    • Applications
    • Audit Logs
    • Connectors
      • Overview
      • Generic
      • LDAP
    • Consent
    • Emails
    • Event Logs
    • Families
    • Forms
    • Form Fields
    • Groups
    • Identity Providers
      • Overview
      • Apple
      • Facebook
      • Google
      • HYPR
      • LinkedIn
      • Twitter
      • OpenID Connect
      • SAML v2
      • External JWT
    • Integrations
    • JWT
    • Keys
    • Lambdas
    • Login
    • Passwordless
    • Registrations
    • Reports
    • System
    • Tenants
    • Themes
    • Two Factor
    • Users
    • User Actions
    • User Action Reasons
    • User Comments
    • Webhooks
  • Client Libraries
    • Overview
    • Dart
    • Go
    • Java
    • JavaScript
    • .NET Core
    • Node
    • PHP
    • Python
    • Ruby
    • Typescript
  • Themes
    • Overview
    • Localization
    • Examples
  • Email & Templates
    • Overview
    • Configure Email
    • Email Templates
  • Events & Webhooks
    • Overview
    • Events
    • Writing a Webhook
    • Securing Webhooks
  • Example Apps
    • Overview
    • Go
    • Java
    • JavaScript
    • .NET Core
    • PHP
    • Python
    • Ruby
  • Lambdas
    • Overview
    • Apple Reconcile
    • External JWT Reconcile
    • Facebook Reconcile
    • Google Reconcile
    • HYPR Reconcile
    • JWT Populate
    • LDAP Connector Reconcile
    • LinkedIn Reconcile
    • OpenID Connect Reconcile
    • SAML v2 Populate
    • SAML v2 Reconcile
    • Twitter Reconcile
  • Identity Providers
    • Overview
    • Apple
    • Facebook
    • Google
    • HYPR
    • LinkedIn
    • Twitter
    • OpenID Connect
      • Overview
      • Azure AD
      • Github
      • Discord
    • SAML v2
      • Overview
      • ADFS
    • External JWT
      • Overview
      • Example
  • Connectors
    • Overview
    • Generic Connector
    • LDAP Connector
    • FusionAuth Connector
  • Integrations
    • Overview
    • CleanSpeak
    • Kafka
    • Twilio
  • OpenID Connect & OAuth 2.0
    • Overview
    • Endpoints
    • Tokens
  • SAML v2 IdP
    • Overview
    • Google
    • Zendesk
  • Plugins
    • Writing a Plugin
    • Password Encryptors
  • Guides
    • Overview
    • Advanced Registration Forms
    • Breached Password Detection
    • Migration
    • Passwordless
    • Securing Your APIs
    • Silent Mode
    • Single Sign-on
  • Tutorials
    • Overview
    • Setup Wizard & First Login
    • Register/Login a User
    • Migrate Users
    • JSON Web Tokens
    • Authentication Tokens
    • Start and Stop FusionAuth
    • Switch Search Engines
    • User Account Lockout
    • Two Factor
  • Reference
    • CORS
    • Configuration
    • Data Types
    • Known Limitations
    • Password Encryptors
  • Release Notes
  • Troubleshooting

FusionAuth Java Client

Java Client Library

The Java client library allows you to integrate FusionAuth with your Java application.

Source Code:

  • https://github.com/FusionAuth/fusionauth-java-client

Maven Dependency

<dependency>
  <groupId>io.fusionauth</groupId>
  <artifactId>fusionauth-java-client</artifactId>
  <version>1.7.0</version>
</dependency>

When building your application, utilize the version that corresponds to the version of FusionAuth your running. View all available versions on https://search.maven.org

Using the FusionAuth and consuming the ClientResponse

The Java client has two styles of use, the first return a ClientResponse object. This object contains everything that occurred while communicating with the FusionAuth server. If the communication with the server encountered a network issue, the ClientResponse.exception might contain an IOException.

The following code assumes FusionAuth is running on http://localhost:9011 and uses an API key 6b87a398-39f2-4692-927b-13188a81a9a3, you will need to supply your own API key, and if you are not running FusionAuth locally, your host parameter may be different.

Here is an example of using the retrieveUserByEmail method to retrieve a User by an email address.

import com.inversoft.error.Errors;
import io.fusionauth.client.FusionAuthClient;
import io.fusionauth.domain.User;
import io.fusionauth.domain.api.UserResponse;
import com.inversoft.rest.ClientResponse;

public class Example {
  private final FusionAuthClient client;

  public Example() {
    client = new FusionAuthClient("6b87a398-39f2-4692-927b-13188a81a9a3", "http://localhost:9011");
  }

  public User getUserByEmail(String email) {
    ClientResponse<UserResponse, Errors> response = client.retrieveUserByEmail(email);
    if (response.wasSuccessful()) {
      return response.successResponse.user;
    } else if (response.errorResponse != null) {
      // Error Handling
      Errors errors = response.errorResponse;
    } else if (response.exception != null) {
      // Exception Handling
      Exception exception = response.exception;
    }

    return null;
  }
}

Using the Lambda Delegate

The Java Client may also be used along with our Lambda delegate that provides exception handling and allows you to write code assuming a happy path. Here is the same example from above using the lambda delegate:

import com.inversoft.error.Errors;
import io.fusionauth.client.LambdaDelegate;
import io.fusionauth.client.FusionAuthClient;
import io.fusionauth.domain.User;
import com.inversoft.rest.ClientResponse;

public class Example {
  private final String apiKey = "6b87a398-39f2-4692-927b-13188a81a9a3";

  private final String fusionauthURL = "http://localhost:9011";

  private final FusionAuthClient client;

  private final LambdaDelegate delegate;

  public Example(String apiKey, String fusionauthURL) {
    this.client = new FusionAuthClient(apiKey, fusionauthURL);
    this.delegate = new LambdaDelegate(this.client, (r) -> r.successResponse, this::handleError);
  }

  public User getUserByEmail(String email) {
    return delegate.execute(c -> c.retrieveUserByEmail("user@example.com")).user;
  }

  private <T, U> void handleError(ClientResponse<T, U> clientResponse) {
    if (clientResponse.exception != null) {
      // Handle the exception
      ...
    } else if (clientResponse.errorResponse != null && clientResponse.errorResponse instanceof Errors) {
      // Handle errors
      ...
    }
  }
}

As you can see, using the lambda delegate requires less code to handle the success response and the error handling code can be re-used.

Related Posts

  • Using Java to manage FusionAuth

Example apps

  • Java jwt - JWT creation and decoding examples with the fusionauth-jwt library
  • Password encryptors - Example of custom password encryptors to help with user migration
  • Spring security - Uses Spring Security and OIDC to authenticate users
  • User and application management - Using the FusionAuth client library to add and remove users and applications

Feedback

How helpful was this page?

See a problem?

File an issue in our docs repo

Quick Links

  • Download
  • Cloud Pricing
  • Editions Pricing
  • Contact Us
  • Jobs (come work with us)
  • My Account

Resources

  • Docs
  • Blog
  • Community & Support
  • Upgrade from SaaS
  • Upgrade from Homegrown
  • Upgrade from Open Source

Everything Else

  • Privacy Policy
  • Product Privacy Policy
  • License
  • License FAQ
  • Enterprise Sales FAQ
  • Security (contact, bug bounty, etc)
  • Technical Support

Connect with Us

logo
Subscribe for Updates
We only send dev friendly newsletters. No marketing fluff!
© 2021 FusionAuth