@SpringBootApplication // You can make a regular Spring Boot application
public class Application {

    public static void main(String... args) {
        // This starts your app alongside gh-event-api
        GHEventApiServer.start(Application.class, args);
    }

    @Bean // Declaring your handlers as Spring beans will bootstrap them
    public PushHandler pushHandler() {
        return payload -> {
            System.out.println("got payload: " + payload);
        };
    }

    @Bean // You can declare as many handlers as you want/need
    public PushHandler anotherPushHandler() {
        return payload -> {
            System.out.println("got payload: " + payload);
        };
    }

}