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Using the Kotlin/Java SDK

As of August 2023, Nylas offers a Kotlin/Java SDK as part of Nylas v3, in addition to the legacy Java-only v2.7 SDK.

The v2.x Kotlin/Java SDK is only compatible with v3.x Nylas APIs. If you’re still using an earlier version of Nylas, you should keep using the v1.x Java SDK until you can upgrade to Nylas v3.

Before you begin

Before you can start using the Nylas Kotlin/Java SDK, make sure you have done the following:

Install the Nylas Kotlin/Java SDK

Note: The Nylas Kotlin/Java SDK requires Java 8 or later.

For the following examples, replace X.X.X with the version you want to use. See the list of Kotlin/Java SDK releases to learn about the available versions.

Set up with Gradle

If you’re using Gradle, add the following code to the dependencies section of your build.gradle file. Be sure to use only the code that matches the SDK version you want to use.

Set up with Maven

For projects using Maven, add the following code to your POM file.

<dependency>
<groupId>com.nylas.sdk</groupId>
<artifactId>nylas</artifactId>
<version>X.X.X</version>
</dependency>

Initialize the Nylas Client

To start using the Kotlin/Java SDK, you must initialize the NylasClient object. The Nylas client allows you to access the Manage Grants endpoints.

To create a Nylas application client object, initialize a NylasClient object and pass in your Nylas application’s API key and API URI.

Be careful with secrets! Follow best practices when you include secrets like your access token in your code. A more secure way to provide these values is to use a KeyStore to protect sensitive information.

Test Kotlin/Java SDK installation

Now that you have the Kotlin/Java SDK installed and set up, you can make a simple program to test your installation. For example, the following code makes a request to return information about your Nylas application.

Authenticate users

The Nylas APIs use OAuth 2.0 and let you choose to authenticate using either an API key or access token. For more information about authenticating with Nylas, see the Authentication guide.

In practice, Nylas’ REST API simplifies the OAuth process to two steps: redirecting the user to Nylas, and handling the auth response.

Redirect user to Nylas

The following code samples redirect a user to Nylas for authentication.

Nylas provides granular auth scopes that allow you to control the level of access your application has to users’ data. For a list of scopes that Nylas supports, see the Authentication scopes documentation.

Handle the authentication response

Next, your application has to handle the authentication response from Nylas, as in the examples below.

Latest supported version

For the latest supported version of the SDK, see the Releases page on GitHub.

Method and model reference

The Nylas Kotlin/Java SDK includes method and model documentation, so you can easily find the implementation details you need.

GitHub repositories

The Nylas Kotlin/Java SDK repository houses the Kotlin/Java SDK and a number of useful tutorials that demonstrate how to handle things like webhooks, Custom authentication, and Hosted OAuth. You can contribute to the SDK by creating an issue or opening a pull request.

For code samples, visit the Nylas Samples repository.

Tutorials