Encryption/Decryption Issue

ptLength += cipher.doFinal(plainText, outputSize);

String s;
        while ((s = in.readLine()) != null)
		{
			try
			{
				//Beginning of the AES Decryption process
				byte[] input = s.getBytes();
				byte[] cipherText = new byte[input.length];
				SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");
				Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding", "BC");
				int ctLength = s.length();
				byte[] plainText = new byte[ctLength];
				
				cipher.init(Cipher.DECRYPT_MODE, key);
				
				int ptLength = cipher.update(cipherText, 0, ctLength, plainText, 0);
				int outputSize = cipher.getOutputSize((ctLength/16 + 1) * 16);
				
				ptLength += cipher.doFinal(plainText, outputSize);
				/*
				System.out.println("plain text : " + new String(plainText) + " bytes: " + ptLength);
				
				//End of the AES Decryption process
				
				String encryptedText = new String(cipherText);
				enteredText.setText(encryptedText + "\n");
			
				enteredText.insert(new String(plainText) + "\n", new String(plainText).length());
				enteredText.setCaretPosition(new String(plainText).length());
				*/
				
			}
			catch (Exception ace)
			{
				enteredText.setText("Error during AES Decryption process");
			}
        }