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

<dependency>
  <groupId>com.launchdarkly</groupId>
  <artifactId>launchdarkly-java-server-sdk</artifactId>
  <version>7.15.0</version>
</dependency>

Initialize the SDK

Java SDK initialization

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

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.