launchdarkly/hello-java

Hello LaunchDarkly for Java

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.

hello-java's Issues

Code

https://github.com/launchdarkly/hello-java/commits?author=aengelberg

SDK Version in POM 4.8

Online documentation for working with the Launchdarkly SDK shows examples with 4.12.0.

Java SDK dependency version for this project is 4.8.0. A lot of the code examples simply would not compile with 4.8.0. It wasn't until someone else was working with me that they pointed out the dependency version being 4 versions behind the documentation.

naming bug

Hi, this repo is linked in the app Quickstart docs, so noting here a minor naming mismatch between the tutorial project's class file App.java (as downloaded in step 2a: mvn archetype:generate -DgroupId=com.launchdarkly.tutorial -DartifactId=hello-java) compared to the class Hello.java referenced in the Maven Assembly Plugin code in documentation step 2c, line: <mainClass>Hello</mainClass> and step 2e, line: public class Hello {

Was not a big deal to resolve the naming, only detracted a little from the "It Just Works!" feeling when setting up LaunchDarkly for the first time and getting ClassNotFoundException.

When downloading the project, I accepted all default options (Enter) when prompted. Thanks for considering this suggestion for the Quickstart docs.