@Override
        public char[] keyPassword() {
            return keyPassword;
        }
Loads this keystore
@return the keystore
@throws KafkaException if the file could not be read or if the keystore could not be loaded
  using the specified configs (e.g. if the password or keystore type is invalid)
clients/src/main/java/org/apache/kafka/common/security/ssl/DefaultSslEngineFactory.java