Re: (Encryption Package) error: cannot find symbol symbol: class BaseNCode

When I add the below code (from line 2 in first post), I see the error for constant "Base64.DEFAULT" as:
cannot find symbol
  symbol: variable DEFAULT
 //Code from link 2 in first posting:
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import org.apache.commons.codec.binary.Base64;
    

    private final String characterEncoding = "UTF-8";

    private final String cipherTransformation = "AES/CBC/PKCS5Padding";

    private final String aesEncryptionAlgorithm = "AES";
  
    public byte[] decrypt(byte[] cipherText, byte[] key, byte [] initialVector) throws NoSuchAlgorithmException,
                                                                                        NoSuchPaddingException,
                                                                                        InvalidKeyException,
                                                                                        InvalidAlgorithmParameterException,
                                                                                        IllegalBlockSizeException,
                                                                                        BadPaddingException
    {
        Cipher cipher = Cipher.getInstance(cipherTransformation);

        SecretKeySpec secretKeySpecy = new SecretKeySpec(key, aesEncryptionAlgorithm);

        IvParameterSpec ivParameterSpec = new IvParameterSpec(initialVector);

        cipher.init(Cipher.DECRYPT_MODE, secretKeySpecy, ivParameterSpec);

        cipherText = cipher.doFinal(cipherText);

        return cipherText;

    }

    public byte[] encrypt(byte[] plainText, byte[] key, byte [] initialVector) throws NoSuchAlgorithmException,
                                                                                      NoSuchPaddingException,
                                                                                      InvalidKeyException,
                                                                                      InvalidAlgorithmParameterException,
                                                                                      IllegalBlockSizeException,
                                                                                      BadPaddingException
    {
        Cipher cipher = Cipher.getInstance(cipherTransformation);

        SecretKeySpec secretKeySpec = new SecretKeySpec(key, aesEncryptionAlgorithm);

        IvParameterSpec ivParameterSpec = new IvParameterSpec(initialVector);

        cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, ivParameterSpec);

        plainText = cipher.doFinal(plainText);

        return plainText;
    }

    private byte[] getKeyBytes(String key) throws UnsupportedEncodingException
    {
        byte[] keyBytes= new byte[16];

        byte[] parameterKeyBytes= key.getBytes(characterEncoding);

        System.arraycopy(parameterKeyBytes, 0, keyBytes, 0, Math.min(parameterKeyBytes.length, keyBytes.length));

        return keyBytes;
    }

    /// <summary>
    /// Encrypts plaintext using AES 128bit key and a Chain Block Cipher and returns a base64 encoded string
    /// </summary>
    /// <param name="plainText">Plain text to encrypt</param>
    /// <param name="key">Secret key</param>
    /// <returns>Base64 encoded string</returns>

   public String encrypt(String plainText, String key) throws UnsupportedEncodingException,
                                                              InvalidKeyException,
                                                              NoSuchAlgorithmException,
                                                              NoSuchPaddingException,
                                                              InvalidAlgorithmParameterException,
                                                              IllegalBlockSizeException, BadPaddingException
   {
       byte[] plainTextbytes = plainText.getBytes(characterEncoding);

       byte[] keyBytes = getKeyBytes(key);

       return Base64.encodeToString(encrypt(plainTextbytes,keyBytes, keyBytes), Base64.DEFAULT);

   }

   /// <summary>
   /// Decrypts a base64 encoded string using the given key (AES 128bit key and a Chain Block Cipher)
   /// </summary>
   /// <param name="encryptedText">Base64 Encoded String</param>
   /// <param name="key">Secret Key</param>
   /// <returns>Decrypted String</returns>
   public String decrypt(String encryptedText, String key) throws KeyException,
                                                                  GeneralSecurityException,
                                                                  GeneralSecurityException,
                                                                  InvalidAlgorithmParameterException,
                                                                  IllegalBlockSizeException,
                                                                  BadPaddingException,
                                                                  IOException
   {
       byte[] cipheredBytes = Base64.decode(encryptedText, Base64.DEFAULT);

       byte[] keyBytes = getKeyBytes(key);

       return new String(decrypt(cipheredBytes, keyBytes, keyBytes), characterEncoding);
   }