CORS in Jetty & Jersey

To enable cross-origin requests in a self-contained Jetty jar file with Jersey REST services (to allow calls from Swagger-UI). Create a CORSResponseFilter class:

public class CORSResponseFilter implements ContainerResponseFilter {

    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext)
            throws IOException {

        MultivaluedMap headers = responseContext.getHeaders();

        headers.add("Access-Control-Allow-Origin", "*");
        //headers.add("Access-Control-Allow-Origin", "http://podcastpedia.org"); //allows CORS requests only coming from podcastpedia.org
        headers.add("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");
        headers.add("Access-Control-Allow-Headers", "X-Requested-With, Content-Type, X-Codingpedia");
    }

}

And reference it in your main App class:

public class App {
    public static void main(String[] args) throws Exception {
        URI baseUri = UriBuilder.fromUri("http://localhost/").port(8080).build();
        ResourceConfig config = new ResourceConfig(API.class);
        config.register(CORSResponseFilter.class);
        Server jettyServer = JettyHttpContainerFactory.createServer(baseUri, config);

        try {
            jettyServer.start();
            jettyServer.join();
        } finally {
            jettyServer.destroy();
        }
    }
}