Background org.xnio.nio.WorkerThread prevents JVM shutdown (using jboss-client.jar for remote JMX access)

import java.io.IOException;
import java.net.MalformedURLException;
import java.util.HashMap;

import javax.management.MBeanServerConnection;
import javax.management.remote.JMXConnector;
import javax.management.remote.JMXConnectorFactory;
import javax.management.remote.JMXServiceURL;

public class Demo {
	public static void main(String[] args) throws IOException {
		JMXConnector jmxConnector = null;

		String host = "some.unreachable.host";
		String port = "9999";
		String urlString = "service:jmx:remoting-jmx://" + host + ":" + port;
		try {
			JMXServiceURL serviceURL = new JMXServiceURL(urlString);
			HashMap<String, String[]> env = new HashMap<String, String[]>();
			String[] creds = new String[2];
			creds[0] = "username";
			creds[1] = "password";
			env.put(JMXConnector.CREDENTIALS, creds);
			jmxConnector = JMXConnectorFactory.connect(serviceURL, env);
			MBeanServerConnection connection = jmxConnector.getMBeanServerConnection();
			System.out.println("Successfully Got Connection  " + connection.getMBeanCount());
			jmxConnector.close();
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (jmxConnector != null) {
				jmxConnector.close();
			}
		}

		System.exit(0);
	}
}