<dependency> <groupId>io.vertx</groupId> <artifactId>vertx-codegen</artifactId> <version>${vertx.version}</version> </dependency> @VertxGen public interface UserService { void getUser(String id, Handler<AsyncResult<User>> resultHandler); } UserService userService = new UserServiceVertxEBProxy(vertx, "serviceAddress"); userService.getUser("123", res -> { if (res.succeeded()) { User user = res.result(); } else { } });