Set up Java (server-side) SDK | LaunchDarkly

Install and initialize the LaunchDarkly Java SDK to start evaluating feature flags in your application.

Install the package

1 <dependency>
2   <groupId>com.launchdarkly</groupId>
3   <artifactId>launchdarkly-java-server-sdk</artifactId>
4   <version>7.0.0</version>
5 </dependency>

Initialize the SDK

Java SDK initialization

1 import com.launchdarkly.sdk.*;
2 import com.launchdarkly.sdk.server.*;
3 
4 public class Main {
5   public static void main(String[] args) {
6     LDConfig config = new LDConfig.Builder().build();
7 
8     // This is your LaunchDarkly SDK key.
9     // Never hardcode your SDK key in production.
10     final LDClient client = new LDClient("YOUR_SDK_KEY", config);
11 
12     if (client.isInitialized()) {
13       // For onboarding purposes only we flush events as soon as
14       // possible so we quickly detect your connection.
15       // You don't have to do this in practice because events are automatically flushed.
16       client.flush();
17       System.out.println("SDK successfully initialized!");
18     }
19   }
20 }

Finding your SDK credentials

You can find your server-side SDK keys, mobile keys, and client-side ID on the SDK keys page under Settings.

To learn more, read Initialize the client in the Java SDK reference guide.