Java Security

the following code works fine when i supply the correct password, but what if the user puts in the wrong password? an exception is thrown. i would assume that if the wrong password is supplied, the data would be garbled.

btw...excuse the terrible exception handling...i'm just trying to get something up and running

import java.io.*;
import javax.crypto.*;
import javax.crypto.spec.*;

public class PBEncryptor {
	
	private static final byte[] SALT = {
		(byte)0xc7, (byte)0x73, (byte)0x21, (byte)0x8c, 
		(byte)0x7e, (byte)0xc8, (byte)0xee, (byte)0x99
	};
	private static final int ITERATIONS = 8;
	
	/* Encrypts a String by creating a key using the given password
	 */
	public byte[] encryptString(String pass, String text) {
		try {
			//convert password to array of char
			char[] password = pass.toCharArray();
		
			//initialize SecretKeyFactory and specify type of encryption
			SecretKeyFactory skf = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
			
			//create the key
			SecretKey key = skf.generateSecret(new PBEKeySpec(password));
		
			//create the cipher
			Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
			cipher.init(Cipher.ENCRYPT_MODE, key, new PBEParameterSpec(SALT, ITERATIONS));
		
			//encrypt the data
			byte[] rawData = text.getBytes();
			byte[] encryptedData = cipher.doFinal(rawData);
			
			return encryptedData;
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return null;
	}
	
	/* Decrypts a String by creating a key using the given password
	 */
	public String decryptString(String pass, byte[] data) {
		try {
			//convert password to array of char
			char[] password = pass.toCharArray();
			
			//initialize SecretKeyFactory and specify type of encryption
			SecretKeyFactory skf = SecretKeyFactory.getInstance("PBEWithMD5AndDES");
				
			//create the key
			SecretKey key = skf.generateSecret(new PBEKeySpec(password));
			
			//create the cipher
			Cipher cipher = Cipher.getInstance("PBEWithMD5AndDES");
			cipher.init(Cipher.DECRYPT_MODE, key, new PBEParameterSpec(SALT, ITERATIONS));
			
			//decrypt the data
			byte[] decryptedData = cipher.doFinal(data); //THIS IS LINE 60
			
			//convert the decrypted bytes to a String
			String decryptedString = new String(decryptedData);
			
			return decryptedString;
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return null;
	}

using this code as a test works...

PBEncryptor pbe = new PBEncryptor();
		byte[] b = pbe.encryptString("edfts", "idjalskidifloaksjdlskalskdjdi");
		String s = pbe.decryptString("edfts", b);
		System.out.println(s);

using this code as a test, i run into problems...

PBEncryptor pbe = new PBEncryptor();
		byte[] b = pbe.encryptString("edfts10", "idjalskidifloaksjdlskalskdjdi");
		String s = pbe.decryptString("blah", b);
		System.out.println(s);

the stack trace...
javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)
at com.sun.crypto.provider.SunJCE_h.b(DashoA12275)
at com.sun.crypto.provider.SunJCE_ae.b(DashoA12275)
at com.sun.crypto.provider.PBEWithMD5AndDESCipher.engineDoFinal(DashoA12
275)
at javax.crypto.Cipher.doFinal(DashoA12275)
at PBEncryptor.decryptString(PBEncryptor.java:60)
at PBEncryptor.main(PBEncryptor.java:76)