Launch an embedded Grizzly Server for Heroku cloud provider AND local environment

Grizzly4Heroku.java

package com.agile.spirit.openapi;

import java.io.IOException;
import java.net.URI;
import java.util.List;

import javax.ws.rs.core.UriBuilder;

import org.glassfish.grizzly.http.server.HttpServer;

import com.sun.jersey.api.container.grizzly2.GrizzlyServerFactory;
import com.sun.jersey.api.core.PackagesResourceConfig;
import com.sun.jersey.api.core.ResourceConfig;

public class Main {

    private static URI getBaseURI(String hostname, int port) {
        return UriBuilder.fromUri("http://0.0.0.0/").port(port).build();
    }

    protected static HttpServer startServer(URI uri) throws IOException {
        System.out.println("Starting grizzly...");
        ResourceConfig rc = new PackagesResourceConfig("com.agile.spirit.openapi");
        return GrizzlyServerFactory.createHttpServer(uri, rc);
    }

    public static void main(String[] args) throws IOException {
        String hostname = System.getenv("HOSTNAME");
        if (hostname == null) {
            hostname = "localhost";
        }

        boolean isOnLocal = false;
        String port = System.getenv("PORT");
        if (port == null) {
            isOnLocal = true;
            port = "9998";
        }

        URI uri = getBaseURI(hostname, Integer.valueOf(port));

        HttpServer httpServer = startServer(uri);
        System.out.println(String.format("Jersey app started with WADL available at "
                + "%sapplication.wadl\nHit enter to stop it...", uri, uri));
        if (isOnLocal) {
            System.in.read();
            httpServer.stop();
        } else {
            while (true) {
                System.in.read();
            }
        }

    }
}

pom.xml

<dependency>
    <groupId>org.glassfish.grizzly</groupId>
    <artifactId>grizzly-framework</artifactId>
    <version>2.2.19</version>
</dependency>

<repository>
    <id>glassfish-maven2-repository.dev.java.net</id>
    <name>Java.net Maven 2 Repository for GlassFish</name>
    <url>https://maven.java.net/content/repositories/releases/</url>
</repository>

Procfile

web: java -cp target/classes:target/dependency/* com.agile.spirit.openapi.Main