This message cannot be recycled because it is still in use

I'm trying to use this article to create asynchronous UDP socket.

So I've this code:

import android.os.Handler;
import android.os.HandlerThread;
import android.os.Message;

import java.net.DatagramSocket;
import java.net.SocketException;

public class UdpThread
    extends HandlerThread {

    private static final String TAG = "UDP";
    private final Handler uiHandler, workerHandler;
    private final DatagramSocket socket = new DatagramSocket();

    public UdpThread(final Handler uiHandler, final String hostname, final int port) throws SocketException {
        super(TAG);
        this.uiHandler = uiHandler;
        start();
        workerHandler = new Handler(getLooper(), new Handler.Callback() {
            @Override
            public boolean handleMessage(final Message msg) {
                /*
                if (msg.what == port && msg.obj == hostname) {
                    final InetSocketAddress address = new InetSocketAddress(hostname, port);
                    Log.d(TAG, "Connecting to " + address);
                    try {
                        socket.connect(address);
                    } catch (SocketException se) {
                        throw new RuntimeException(se);
                    }
                }
                */
                msg.recycle(); //java.lang.IllegalStateException: This message cannot be recycled because it is still in use.
                return true;
            }
        });
        workerHandler.obtainMessage(port, hostname).sendToTarget();
    }
}

But when I run the code, I get the mentioned java.lang.IllegalStateException: This message cannot be recycled because it is still in use. when trying to recycle the message. Why is that and how to solve it and prevent memory leaks?