private List<String> requiredScope() {
        String requiredSpaceDelimitedScope = option(REQUIRED_SCOPE_OPTION);
        return Utils.isBlank(requiredSpaceDelimitedScope) ? Collections.emptyList() : OAuthBearerScopeUtils.parseScope(requiredSpaceDelimitedScope.trim());
    }
Return true if this instance has been configured, otherwise false

@return true if this instance has been configured, otherwise false
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/unsecured/OAuthBearerUnsecuredValidatorCallbackHandler.java