Convert from jpasswordfield to publickey?

See more:

Java

AES

RSA

suppose you ask user to generate public_key using JPasswordField and then you should take this public_key to encrypt random_key what should I do?

What I have tried:

public void AESEncryption(File file) throws FileNotFoundException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
    String data;
    SecretKey random_key;
    int key_size=128;

    Scanner myReader = new Scanner(file);
    while (myReader.hasNextLine()) {
        data = myReader.nextLine();
    }

    // create GenerateKey object to access public key
    // GenerateKey is my personal class and contain public key that generated from user using JPasswordField
    GenerateKey key = new GenerateKey();

    // convert public key to string
    String public_Key = key.PublicKey.getText();

    // convert string public key to secret key
    byte[] decodedKey = Base64.getDecoder().decode(public_Key);
    SecretKey originalKey = new SecretKeySpec(decodedKey, 0, decodedKey.length, "AES");

    // generate random key
    KeyGenerator g = KeyGenerator.getInstance("AES");
    // give it size
    g.init(key_size);
    random_key = g.generateKey();

    // encrypt the random key with RSA and public key
    byte[] random_byteKey = random_key.getEncoded();
    Cipher cipher_Key = Cipher.getInstance("RSA/ECB/PKCS1Padding");
    cipher_Key.init(Cipher.ENCRYPT_MODE, originalKey);
    byte[] encrypted_key = cipher_Key.doFinal(random_byteKey); //RSA key

    // after generating RSA key we will Encrypt file using RSA key
    byte[] byte_message = data.getBytes();
    Cipher cipherTxt = Cipher.getInstance("AES/GCM/NoPadding");
    // the problem in here 
    cipherTxt.init(Cipher.ENCRYPT_MODE, encrypted_key);

    byte[] encByte = cipherTxt.doFinal(byte_message);
}