XmlMapper xmlMapper = new XmlMapper(); xmlMapper.enable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES); xmlMapper.enable(Feature.DISABLE_DTD); XmlMapper xmlMapper = new XmlMapper(); Cipher cipher = Cipher.getInstance("AES"); SecretKeySpec secretKeySpec = new SecretKeySpec(encryptionKey, "AES"); cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec); byte[] encryptedData = cipher.doFinal(dataToEncrypt.getBytes()); String encryptedXmlData = Base64.getEncoder().encodeToString(encryptedData);