A Java Reappt client that subscribes another client to a topic

Gatekeeper.java

import java.util.Collection;

import com.pushtechnology.diffusion.client.Diffusion;
import com.pushtechnology.diffusion.client.callbacks.ErrorReason;
import com.pushtechnology.diffusion.client.features.control.topics.SubscriptionControl;
import com.pushtechnology.diffusion.client.features.control.topics.SubscriptionControl.SubscriptionByFilterCallback;
import com.pushtechnology.diffusion.client.session.Session;
import com.pushtechnology.diffusion.client.types.ErrorReport;

public class Gatekeeper {

	private static Session session;
	private static SubscriptionControl subscriptionControl;

	public static void main(String... arguments) throws Exception {

		// Connect to Reappt
		session = Diffusion.sessions().principal("gatekeeper")
				.password("repeeketag")
				.open("wss://approvingBoldDaVinci.us.reappt.io:443");

		subscriptionControl = session.feature(SubscriptionControl.class);

		// Subscribe the Requester session to the closed/cats topic
		subscriptionControl.subscribeByFilter("$Principal IS 'requester'",
				"closed/cats", new SubscriptionByFilterCallback.Default());
		
		while(true){
			// Loop a while
		}
	}
}