Java Security

Hello,
I am trying to encrypt a string within the same class. I am using the same key for both encrypting and decrypting. Not being familiar with JCE I am not sure what the exception here means -

java.security.InvalidAlgorithmParameterException: Wrong IV length: must be 8 bytes long. I am using JDK 1.4.2.

Here is the code for encrypting and decrypting(its adapted from the Scott Oaks book) -

private AToken getSOAPAuthToken(String p_userName) throws Exception
{
KeyGenerator kg = KeyGenerator.getInstance("DES");
Cipher c = Cipher.getInstance("DES/CBC/PKCS5Padding");
Key key = kg.generateKey();
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("keyFile"));
oos.writeObject(key);
c.init(Cipher.ENCRYPT_MODE,key);
byte input[] = p_userName.getBytes();
byte encrypted[] = c.doFinal(input);
String userToken = new sun.misc.BASE64Encoder().encode(input);
String userVector = new sun.misc.BASE64Encoder().encode(encrypted);
AToken sat = new AToken(userToken,userVector);
return aToken;
}
private void decryptToken(AToken p_sat) throws Exception
{
Cipher c = Cipher.getInstance("DES/CBC/PKCS5Padding");
ObjectInputStream ois = new ObjectInputStream(new FileInputStream("keyFile"));
Key key = (Key)ois.readObject();
String userVector = p_sat.getUserToken();
byte iv[] = new sun.misc.BASE64Decoder().decodeBuffer(userVector);
IvParameterSpec dps = new IvParameterSpec(iv);
c.init(Cipher.DECRYPT_MODE, key,dps);
byte encrypted[] = new sun.misc.BASE64Decoder().decodeBuffer(p_sat.getUserToken());
byte output[] = c.doFinal(encrypted);
s_logger.info("The value of output is " + new String(output));
}