LaunchDarkly sample Java application

We've built a simple console application that demonstrates how LaunchDarkly's SDK works.

Below, you'll find the basic build procedure, but for more comprehensive instructions, you can visit your Quickstart page or the Java SDK reference guide.

Build instructions

This project uses Gradle. It requires that Java is already installed on your system (version 8 or higher). It will automatically use the latest release of the LaunchDarkly SDK with major version 7.

1. Set the value of environment variable LAUNCHDARKLY_SDK_KEY to your LaunchDarkly SDK key. If there is an existing boolean feature flag in your LaunchDarkly project that you want to evaluate, edit src/main/java/Hello.java and set FEATURE_FLAG_KEY in code to the flag key.

  export LAUNCHDARKLY_SDK_KEY=1234567890abcdef

  static final String FEATURE_FLAG_KEY = "my-flag";

2. On the command line, run ./gradlew run (or, on Windows, gradlew run).

You should receive the message "The feature flag evaluates to ." The application will run continuously and react to the flag changes in LaunchDarkly.