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Jersey Server-Sent Events example.
There is a newer version: 2.26-b03
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package org.glassfish.jersey.examples.sse;

import java.io.IOException;
import java.net.URI;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.glassfish.jersey.grizzly2.httpserver.GrizzlyHttpServerFactory;
import org.glassfish.jersey.media.sse.SseFeature;
import org.glassfish.jersey.server.ResourceConfig;

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

/**
 * Server sent event example.
 *
 * @author Pavel Bucek (pavel.bucek at oracle.com)
 */
public class App {

    private static final URI BASE_URI = URI.create("http://localhost:8080/");
    public static final String ROOT_PATH = "server-sent-events";

    public static void main(String[] args) {
        try {
            System.out.println("\"Server-Sent Events\" Jersey Example App");

            final ResourceConfig resourceConfig = new ResourceConfig(ServerSentEventsResource.class, SseFeature.class);

            final HttpServer server = GrizzlyHttpServerFactory.createHttpServer(BASE_URI, resourceConfig);

            System.out.println(String.format("Application started.\nTry out %s%s\nHit enter to stop it...",
                    BASE_URI, ROOT_PATH));
            System.in.read();
            server.shutdownNow();
        } catch (IOException ex) {
            Logger.getLogger(App.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
}