Swift PublicKey in Base64 unreadable in Java

Question

I'm trying to generate EC key Pair and I want to send PublicKey in base64 to backend but I'm getting errors: java.security.spec.InvalidKeySpecException: java.security.InvalidKeyException: IOException: Detect premature EOF and java.lang.IllegalArgumentException: Illegal base64 character 4 Key pair generate:

let keyAttribute = [kSecAttrType as String: kSecAttrKeyTypeECSECPrimeRandom,
                    kSecAttrKeySizeInBits as String: 256] as CFDictionary

 func generatePair() {
      SecKeyGeneratePair(keyAttribute, &publicKeySec, &privateKeySec)
 }

getting base64 public key:

if let publicKeySec = publicKeySec, let cfData = SecKeyCopyExternalRepresentation(publicKeySec, &error) {
     let data: Data = cfData as Data
     let b64Key = data.base64EncodedString()
     return b64Key
}

here is how to backend is trying to decode my publicKey:

private static PublicKey decodePublicKey(String base64PublicKey) {
        PublicKey publicKey = null;
        try {
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(Base64.getDecoder().decode(base64PublicKey.getBytes()));
            KeyFactory keyFactory = KeyFactory.getInstance("EC");
            publicKey = keyFactory.generatePublic(keySpec);
            return publicKey;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return publicKey;
    }