Java Security

Hello

I am getting a problem is transmitting an AES key from a machine to another using the UDP transport protocol.

Actually i am sending an encoded byte array which will be used for generating a SecretKeySpec for the encryption/decryption process. Hoever, the problem that i noticed is that the content of teh byte array at the sender/client(the one who generates the byte array actually) is not the same as the one received after.Below is the code samples.

class testserver
{
public static void main(String args[])throws IOException
{
AES e=new AES();

try
{
byte[] buffer=new byte[16];
DatagramSocket aSocket = new DatagramSocket(222);
DatagramPacket request = new DatagramPacket(buffer, buffer.length);
aSocket.receive(request);
byte[] data=request.getData();
System.out.println("Key received is"+data);
}catch(Exception Error){}
}
}
//this is the server class

->>this class is the client one responsible for generating a key ad sending it to the server

class testSendKey
{
public static void main(String args[])
{
AES e=new AES();

try
{
byte[] key=e.KeyGen(128);
System.out.println(key.length);
InetAddress aHost = InetAddress.getByName("pv");
DatagramSocket aSocket = new DatagramSocket();
DatagramPacket sending = new DatagramPacket(key, key.length,aHost, 222);
aSocket.send(sending);
aSocket.close();
System.out.println("Key sent is:"+key);
}
catch (Exception E){}
}
}

Now below is the AES method KeyGen(Int) which generates a key of a given size


public byte[] KeyGen(int size)throws Exception
{
KeyGenerator kgen = KeyGenerator.getInstance("AES",provider);
kgen.init(size);
//System.out.println(kgen);

// Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] rawByte = skey.getEncoded();

return rawByte;
}

Can someone please tell me whats the problem here.....or else give me an idea where i can generate a key of size (128,192,256) and send it to the server using either UDP or TCP....
Regards