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This is a client library for Nadron server https://github.com/menacher/java-game-server/tree/netty4/nadron. Java clients can use this program to connect and interact with nadron server.
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package io.nadron.client.communication;

import io.nadron.client.util.NettyUtils;
import io.nadron.convert.Transform;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;


/**
 * This class is an implementation of the {@link MessageBuffer} interface. It
 * is a thin wrapper over the the Netty {@link ByteBuf} with some
 * additional methods for string and object read write. It does not expose all
 * methods of the ByteBuf, instead it has a method
 * {@link #getNativeBuffer()} which can be used to retrieve the buffer and then
 * call the appropriate method. For writing to the buffer, this class uses
 * {@link ByteBuf} implementation.
 * 
 * @author Abraham Menacherry
 * 
 */
public class NettyMessageBuffer implements MessageBuffer
{
	private final ByteBuf buffer;

	public NettyMessageBuffer()
	{
		buffer = Unpooled.buffer();
	}

	/**
	 * This constructor can be used when trying to read information from a
	 * {@link ByteBuf}.
	 * 
	 * @param buffer
	 */
	public NettyMessageBuffer(ByteBuf buffer)
	{
		this.buffer = buffer;
	}

	@Override
	public boolean isReadable()
	{
		return buffer.isReadable();
	}

	@Override
	public int readableBytes()
	{
		return buffer.readableBytes();
	}

	@Override
	public byte[] array()
	{
		return buffer.array();
	}

	@Override
	public void clear()
	{
		buffer.clear();
	}

	@Override
	public ByteBuf getNativeBuffer()
	{
		return buffer;
	}

	@Override
	public int readByte()
	{
		return buffer.readByte();
	}

	@Override
	public int readUnsignedByte()
	{
		return buffer.readUnsignedByte();
	}

	@Override
	public byte[] readBytes(int length)
	{
		byte[] bytes = new byte[length];
		buffer.readBytes(bytes);
		return bytes;
	}

	@Override
	public void readBytes(byte[] dst)
	{
		buffer.readBytes(dst);
	}

	@Override
	public void readBytes(byte[] dst, int dstIndex, int length)
	{
		buffer.readBytes(dst, dstIndex, length);
	}

	@Override
	public char readChar()
	{
		return buffer.readChar();
	}

	@Override
	public int readUnsignedShort()
	{
		return buffer.readUnsignedShort();
	}

	@Override
	public int readShort()
	{
		return buffer.readShort();
	}

	@Override
	public int readUnsignedMedium()
	{
		return buffer.readUnsignedMedium();
	}

	@Override
	public int readMedium()
	{
		return buffer.readMedium();
	}

	@Override
	public long readUnsignedInt()
	{
		return buffer.readUnsignedInt();
	}

	@Override
	public int readInt()
	{
		return buffer.readInt();
	}

	@Override
	public long readLong()
	{
		return buffer.readLong();
	}

	@Override
	public float readFloat()
	{
		return buffer.readFloat();
	}

	@Override
	public double readDouble()
	{
		return buffer.readChar();
	}

	@Override
	public String readString()
	{
		return NettyUtils.readString(buffer);
	}

	@Override
	public String[] readStrings(int numOfStrings)
	{
		return NettyUtils.readStrings(buffer, numOfStrings);
	}

	public  V readObject(Transform converter)
	{
		return NettyUtils.readObject(buffer, converter);
	}

	@Override
	public MessageBuffer writeByte(byte b)
	{
		buffer.writeByte(b);
		return this;
	}

	@Override
	public MessageBuffer writeBytes(byte[] src)
	{
		buffer.writeBytes(src);
		return this;
	}

	@Override
	public MessageBuffer writeChar(int value)
	{
		buffer.writeChar(value);
		return this;
	}

	@Override
	public MessageBuffer writeShort(int value)
	{
		buffer.writeShort(value);
		return this;
	}

	@Override
	public MessageBuffer writeMedium(int value)
	{
		buffer.writeMedium(value);
		return this;
	}

	@Override
	public MessageBuffer writeInt(int value)
	{
		buffer.writeInt(value);
		return this;
	}

	@Override
	public MessageBuffer writeLong(long value)
	{
		buffer.writeLong(value);
		return this;
	}

	@Override
	public MessageBuffer writeFloat(float value)
	{
		buffer.writeFloat(value);
		return this;
	}

	@Override
	public MessageBuffer writeDouble(double value)
	{
		buffer.writeDouble(value);
		return this;
	}

	@Override
	public MessageBuffer writeString(String message)
	{
		ByteBuf strBuf = NettyUtils.writeString(message);
		buffer.writeBytes(strBuf);
		return this;
	}

	@Override
	public MessageBuffer writeStrings(String... messages)
	{
		ByteBuf strMultiBuf = NettyUtils.writeStrings(messages);
		buffer.writeBytes(strMultiBuf);
		return this;
	}

	@Override
	public  MessageBuffer writeObject(
			Transform converter, V object)
	{
		ByteBuf objBuf = NettyUtils.writeObject(converter, object);
		buffer.writeBytes(objBuf);
		return this;
	}

}