gistfile1.java

public class ExampleRowKey
{
	long userId;
	String applicationId;
	
	public byte[] getBytes() throws IOException
	{
		ByteArrayOutputStream byteOutput = new ByteArrayOutputStream();
		DataOutputStream data = new DataOutputStream(byteOutput);
		
		data.writeLong(userId);
		data.writeUTF(applicationId);
			
		return byteOutput.toByteArray();
	}
}