Javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8

Question

Hello!
I have encrypted/decrypted one String with DES. I tried to do so on one computer and it seams to work fine. But what I realy want is to encrypt 3 String: username, id, and password, and send them to server. On server I want to decrypt them, and use them to check in database if the person exist. I save this 3 String in an ArrayList, and use ObjectInput/OutputStream to send and receive. Here is some of my code(I hope it is enough for you to help me solve this problem,othervice I will send more).
I get this error: javax.crypto.IllegalBlockSizeException: Input length must be multiple of 8 when decrypting with padded cipher
public class CryptDecryptString {
public byte[] cryptString( String password) throws UnsupportedEncodingException, InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException{
byte [] plainTextPassword = password.getBytes("UTF-8");
System.out.println(new String(plainTextPassword,"UTF-8"));
//SecureRandom sr = new SecureRandom();
String nyckeln = "HELLOHEJ";
byte rawKeyData[] = nyckeln.getBytes();
DESKeySpec dks = new DESKeySpec(rawKeyData);
SecretKey key = SecretKeyFactory.getInstance("DES").generateSecret(dks);
Cipher cipher=Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, key);//, sr);
     System.out.println("\nStart encryption:");
cipher.init(Cipher.ENCRYPT_MODE,key);
     byte[] cipherTextPassword=cipher.doFinal(plainTextPassword);
     System.out.println("Finish encryption:");
     System.out.println(new String(cipherTextPassword));
return cipherTextPassword;
}// end cryptString
public byte[]decryptString(byte[] cipherTextPassword) throws InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
String nyckeln = "HELLOHEJ";
byte rawKeyData[] = nyckeln.getBytes();
DESKeySpec dks = new DESKeySpec(rawKeyData);
SecretKey key = SecretKeyFactory.getInstance("DES").generateSecret(dks);
Cipher cipher=Cipher.getInstance("DES");
     System.out.println("\nStart decryption:");
cipher.init(Cipher.DECRYPT_MODE,key);
     byte[] plainTextPassword=cipher.doFinal(cipherTextPassword);
     System.out.println(" Finnish decryption:");
     System.out.println(new String(plainTextPassword,"UTF-8"));
return plainTextPassword;
}// end decryptString
{public boolean TryLogin(String uname, String insID, String pass) throws Exception{
        connect();
        //sendOutStream = new DataOutputStream(socket.getOutputStream());
        sendOutStream = new ObjectOutputStream(socket.getOutputStream());
        InputStream inpuStream;
        inpuStream = socket.getInputStream();
        BufferedReader in= new BufferedReader(new InputStreamReader(inpuStreamtext s));
        CryptDecryptString cryptString = new CryptDecryptString();
      String krypteradeUname = cryptString.cryptString(uname);
       String krypteradeInsID = cryptString.cryptString(insID);
        String krypteradePass = cryptString.cryptString(pass);
        ArrayList<String> loggInPersonInfo= new ArrayList<String>();
                               loggInPersonInfo.add(krypteradeUname);
                               loggInPersonInfo.add(krypteradeInsID);
                               loggInPersonInfo.add(krypteradePass);
                               Object[] elements = loggInPersonInfo.toArray();
for(int i=0; i < elements.length ; i++)
System.out.println(elements);
sendOutStream.writeObject(loggInPersonInfo);
sendOutStream.close();
sendOutStream.flush();
System.out.println("Skickade information...");
int line = in.read();
if(line > 0){
user_id = line;
return true;
}else{
return false;

Answer 1

Here is the rest of code
public void CheckLogin() throws SQLException, IOException, InterruptedException, InvalidKeyException, NoSuchAlgorithmException, InvalidKeySpecException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException, Exception{
/**InputStream inpuStream;
inpuStream = client.getInputStream();
BufferedInputStream in= new BufferedInputStream(inpuStream);//(new BufferedReader(inpuStream));
inpuStream = client.getInputStream();
ObjectInputStream objectIn = new ObjectInputStream(inpuStream);
ArrayList<String> personLoggIn = new ArrayList<String>();
String krypteradeUname;
String krypteradeInsID ;
String krypteradePass ;
personLoggIn = null;
personLoggIn = (ArrayList<String>)objectIn.readObject();
for (int i=0;i<personLoggIn.size();i++) {
krypteradeUname=personLoggIn.get(0);
krypteradeInsID =personLoggIn.get(1);
krypteradePass = personLoggIn.get(2);
System.out.println(i);
inpuStream.close();
CryptDecryptString decryptString = new CryptDecryptString();
byte[] byteUname = decryptString.decryptString((krypteradeUname.getBytes()));
String username = new String(byteUname);
byte[] byteInsID = decryptString.decryptString((krypteradeInsID.getBytes()));
String instanceID = new String(byteInsID);
byte[] bytePassword = decryptString.decryptString((krypteradePass.getBytes()));
String password = new String(bytePassword);
Please help!
Thanks!