public static ListenerName normalised(String value) {
        if (Utils.isBlank(value)) {
            throw new ConfigException("The provided listener name is null or empty string");
        }
        return new ListenerName(value.toUpperCase(Locale.ROOT));
    }
Create an instance with the provided value converted to uppercase.
clients/src/main/java/org/apache/kafka/common/network/ListenerName.java