<dependencies> <dependency> <groupId>org.osgi</groupId> <artifactId>org.osgi.util.promise</artifactId> <version>1.1.1</version> </dependency> </dependencies> import org.osgi.util.promise.Promise; import org.osgi.util.promise.PromiseFactory; public class PromiseExample { public static void main(String[] args) { PromiseFactory promiseFactory = new PromiseFactory(); Promise<String> promise = promiseFactory.deferred(); promise.resolve("Hello, World!"); promise.then(result -> System.out.println(result)); } }